CASCACascade Atlas

Evidence dossier

CVE-2026-20045

Cisco Unified Communications Products Remote Code Execution Vulnerability

Exploited in the wild (CISA KEV since Jan 21, 2026). NVD reports CVSS 3.1 9.8. Severity assessments differ within at least one CVSS version. EPSS estimates 4.4% exploit likelihood as of Aug 27, 2026.

68.8–75.5Priority evidence range
Evidence current through Aug 27, 2026, 6:09 PM UTC

As of Aug 27, 2026

Normalized restatement

A vulnerability in Cisco Unified Communications Manager (Unified CM), Cisco Unified Communications Manager Session Management Edition (Unified CM SME), Cisco Unified Communications Manager IM & Presence Service (Unified CM IM&P), Cisco Unity Connection, and Cisco Webex Calling Dedicated Instance could allow an unauthenticated, remote attacker to execute arbitrary commands on the underlying operating system of an affected device.  This vulnerability is due to improper validation of user-supplied input in HTTP requests. An attacker could exploit this vulnerability by sending a sequence of crafted HTTP requests to the web-based management interface of an affected device. A successful exploit could allow the attacker to obtain user-level access to the underlying operating system and then elevate privileges to root.  Note: Cisco has assigned this security advisory a Security Impact Rating (SIR) of Critical rather than High as the score indicates. The reason is that exploitation of this vulnerability could result in an attacker elevating privileges to root.

State
PUBLISHED
Published
Jan 21, 2026
Updated
Feb 26, 2026
Evidence coverage
83%

Evidence chronology

What was known when

Download this view's receipt →
  1. Source dateSource date omittedFirst observed by CASCA
    CISA-ADP

    Record text: CISA ADP Vulnrichment

    Inspect raw assertion
    Field
    container
    Value
    CISA ADP Vulnrichment
    Original evidence ↗
  2. Source dateSource date omittedFirst observed by CASCA
    cisco

    Record text: Cisco Unified Communications Products Remote Code Execution Vulnerability

    Inspect raw assertion
    Field
    container
    Value
    Cisco Unified Communications Products Remote Code Execution Vulnerability
    Original evidence ↗
  3. Source dateFirst observed by CASCA
    CISA KEV

    Exploitation cataloged: Cisco Unified Communications Products Code Injection Vulnerability

    Inspect raw assertion
    Field
    observed_exploitation
    Value
    Cisco Unified Communications Products Code Injection Vulnerability
    Original evidence ↗
  4. Source dateFirst observed by CASCA
    FIRST EPSS

    EPSS score: 4.38% probability · 90.58th percentile

    Inspect raw assertion
    Field
    model_probability
    Value
    Probability 0.043820000000; percentile 0.905750000000
    Original evidence ↗

Assessments differ

NVD9.8CVSS 3.1 · source date omitted
psirt@cisco.com8.2CVSS 3.1 · source date omitted

Values are shown separately by source and CVSS version.

ExploitationCatalog member

CISA KEV · catalog date Jan 21, 2026 · first observed Jul 19, 2026

Exploit likelihood4.38%

FIRST EPSS · score date Aug 27, 2026 · 90.6th percentile · first observed Aug 27, 2026

SeverityAssessments differ

NVD · CVSS 3.1 · first observed Jul 19, 2026 · values shown separately below

Evidence detail

Source limits and decisions

Why each evidence state has this value

casca-unknown-reasons-v1
Exploitation statusEvidence supported

Eligible evidence is present for this bounded claim.

Revision
evidence-policy-v1.1.0
Cutoff
Aug 27, 2026
Resolution
None
Exploit likelihoodEvidence supported

Eligible evidence is present for this bounded claim.

Revision
evidence-policy-v1.1.0
Cutoff
Aug 27, 2026
Resolution
None
Severity assessmentAssessments differ

Eligible assertions materially conflict and remain visible side by side.

Revision
casca-direct-cvss-eligibility-v1
Cutoff
Aug 27, 2026
Resolution
Resolve conflict
Affected productsSource-reported scope

The cited source assertion is retained while canonical product linkage remains open.

Revision
casca-factor-d-obligations-v1
Cutoff
Aug 27, 2026
Resolution
Resolve identity

Source comparison

Who said what

CISA-ADPIndependent enrichment
Record text

CISA ADP Vulnrichment

Inspect raw assertion
Field
container
Value
CISA ADP Vulnrichment
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
ciscoOriginal assertion
Record text

Cisco Unified Communications Products Remote Code Execution Vulnerability

Inspect raw assertion
Field
container
Value
Cisco Unified Communications Products Remote Code Execution Vulnerability
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
CISA KEVOriginal assertion
Exploitation cataloged

Cisco Unified Communications Products Code Injection Vulnerability

Inspect raw assertion
Field
observed_exploitation
Value
Cisco Unified Communications Products Code Injection Vulnerability
Source dateFirst observed by CASCAOriginal evidence ↗
FIRST EPSSOriginal assertion
EPSS score

4.38% probability · 90.58th percentile

Inspect raw assertion
Field
model_probability
Value
Probability 0.043820000000; percentile 0.905750000000
Source dateFirst observed by CASCAOriginal evidence ↗

Applicability

Cited product scope

Trace impact →
8Underlying assertions
3Canonical products
8Target assertions
0Constraint assertions

Grouped from 1 configuration nodes in this exact snapshot. Visual grouping is navigational; asset exposure and root cause require cited evidence.

Identity source boundaries
  • Cpe dictionary1,775,266 records · observed through 2026-07-21T06:45:29.809Z27d65b0f-b718-4b4f-bb79-c47c68d09dfa
  • Cpe match643,502 records · observed through 2026-07-21T08:13:17.697Z955dae73-7302-438b-aee1-058d7cc5d48e

6 scope groups

cisco · source assertedCiscoCisco Unified Communications ManagerDirect source scope
Affected: 12.5(1)SU2Affected: 12.5(1)SU1Affected: 12.5(1)Affected: 12.5(1)SU3Affected: 12.5(1)SU4Affected: 14Affected: 12.5(1)SU5Affected: 14SU1Affected: 12.5(1)SU6Affected: 14SU2Affected: 12.5(1)SU7Affected: 12.5(1)SU7aAffected: 14SU3Affected: 12.5(1)SU8Affected: 12.5(1)SU8aAffected: 15Affected: 15SU1Affected: 14SU4Affected: 14SU4aAffected: 15SU1aAffected: 12.5(1)SU9Affected: 15SU2Affected: 15.0.1.13010-1Affected: 15.0.1.13011-1Affected: 15.0.1.13012-1Affected: 15.0.1.13013-1Affected: 15.0.1.13014-1Affected: 15.0.1.13015-1Affected: 15.0.1.13016-1Affected: 15.0.1.13017-1Affected: 15SU3a
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "12.5(1)SU2"}, {"status": "affected", "version": "12.5(1)SU1"}, {"status": "affected", "version": "12.5(1)"}, {"status": "affected", "version": "12.5(1)SU3"}, {"status": "affected", "version": "12.5(1)SU4"}, {"status": "affected", "version": "14"}, {"status": "affected", "version": "12.5(1)SU5"}, {"status": "affected", "version": "14SU1"}, {"status": "affected", "version": "12.5(1)SU6"}, {"status": "affected", "version": "14SU2"}, {"status": "affected", "version": "12.5(1)SU7"}, {"status": "affected", "version": "12.5(1)SU7a"}, {"status": "affected", "version": "14SU3"}, {"status": "affected", "version": "12.5(1)SU8"}, {"status": "affected", "version": "12.5(1)SU8a"}, {"status": "affected", "version": "15"}, {"status": "affected", "version": "15SU1"}, {"status": "affected", "version": "14SU4"}, {"status": "affected", "version": "14SU4a"}, {"status": "affected", "version": "15SU1a"}, {"status": "affected", "version": "12.5(1)SU9"}, {"status": "affected", "version": "15SU2"}, {"status": "affected", "version": "15.0.1.13010-1"}, {"status": "affected", "version": "15.0.1.13011-1"}, {"status": "affected", "version": "15.0.1.13012-1"}, {"status": "affected", "version": "15.0.1.13013-1"}, {"status": "affected", "version": "15.0.1.13014-1"}, {"status": "affected", "version": "15.0.1.13015-1"}, {"status": "affected", "version": "15.0.1.13016-1"}, {"status": "affected", "version": "15.0.1.13017-1"}, {"status": "affected", "version": "15SU3a"}]
cisco · source assertedCiscoCisco Unified Communications Manager IM and Presence ServiceDirect source scope
Affected: 12.5(1)Affected: 12.5(1)SU1Affected: 12.5(1)SU2Affected: 12.5(1)SU3Affected: 12.5(1)SU4Affected: 14Affected: 12.5(1)SU5Affected: 14SU1Affected: 12.5(1)SU6Affected: 14SU2Affected: 14SU2aAffected: 12.5(1)SU7Affected: 14SU3Affected: 12.5(1)SU8Affected: 15Affected: 15SU1Affected: 14SU4Affected: 12.5(1)SU9Affected: 15SU2Affected: 15SU3
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "12.5(1)"}, {"status": "affected", "version": "12.5(1)SU1"}, {"status": "affected", "version": "12.5(1)SU2"}, {"status": "affected", "version": "12.5(1)SU3"}, {"status": "affected", "version": "12.5(1)SU4"}, {"status": "affected", "version": "14"}, {"status": "affected", "version": "12.5(1)SU5"}, {"status": "affected", "version": "14SU1"}, {"status": "affected", "version": "12.5(1)SU6"}, {"status": "affected", "version": "14SU2"}, {"status": "affected", "version": "14SU2a"}, {"status": "affected", "version": "12.5(1)SU7"}, {"status": "affected", "version": "14SU3"}, {"status": "affected", "version": "12.5(1)SU8"}, {"status": "affected", "version": "15"}, {"status": "affected", "version": "15SU1"}, {"status": "affected", "version": "14SU4"}, {"status": "affected", "version": "12.5(1)SU9"}, {"status": "affected", "version": "15SU2"}, {"status": "affected", "version": "15SU3"}]
cisco · source assertedCiscoCisco Unity ConnectionDirect source scope
Affected: 12.5(1)Affected: 12.5(1)SU1Affected: 12.5(1)SU2Affected: 12.5(1)SU3Affected: 12.5(1)SU4Affected: 14Affected: 12.5(1)SU5Affected: 14SU1Affected: 12.5(1)SU6Affected: 14SU2Affected: 12.5(1)SU7Affected: 14SU3Affected: 12.5(1)SU8Affected: 14SU3aAffected: 12.5(1)SU8aAffected: 15Affected: 15SU1Affected: 14SU4Affected: 12.5(1)SU9Affected: 15SU2Affected: 15SU3
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "12.5(1)"}, {"status": "affected", "version": "12.5(1)SU1"}, {"status": "affected", "version": "12.5(1)SU2"}, {"status": "affected", "version": "12.5(1)SU3"}, {"status": "affected", "version": "12.5(1)SU4"}, {"status": "affected", "version": "14"}, {"status": "affected", "version": "12.5(1)SU5"}, {"status": "affected", "version": "14SU1"}, {"status": "affected", "version": "12.5(1)SU6"}, {"status": "affected", "version": "14SU2"}, {"status": "affected", "version": "12.5(1)SU7"}, {"status": "affected", "version": "14SU3"}, {"status": "affected", "version": "12.5(1)SU8"}, {"status": "affected", "version": "14SU3a"}, {"status": "affected", "version": "12.5(1)SU8a"}, {"status": "affected", "version": "15"}, {"status": "affected", "version": "15SU1"}, {"status": "affected", "version": "14SU4"}, {"status": "affected", "version": "12.5(1)SU9"}, {"status": "affected", "version": "15SU2"}, {"status": "affected", "version": "15SU3"}]
NVD CPE · APPLICATIONciscounified_communications_managerVulnerable target · 4 assertions
Any version (unconstrained) (>= 12.5, < 14su5); Any version (unconstrained) (>= 15.0, <= 15su3a)Canonical identity product-54fee77d40dd7771ad0e84af29bd7f6cdcf7db09a6aaa9bb1b2b75a1aa9f75f3Linked exact
Scope supported
Inspect raw assertions
  1. cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:-:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 2
    Logic
    OR
    Version bounds
    from including 15.0; through including 15su3a
    Match ID
    e8ee2a11-29dc-45ef-a9b0-e053c004ef82
  2. cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:session_management:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 3
    Logic
    OR
    Version bounds
    from including 15.0; through including 15su3a
    Match ID
    99e5929a-e9de-4370-a363-66bda1d46bde
  3. cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:session_management:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 1
    Logic
    OR
    Version bounds
    from including 12.5; through excluding 14su5
    Match ID
    27bc4e6e-8c4d-4eea-a8db-8cbc11349336
  4. cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:-:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 0
    Logic
    OR
    Version bounds
    from including 12.5; through excluding 14su5
    Match ID
    9a84a37b-553f-48b5-8f92-678a478ee896
NVD CPE · APPLICATIONciscounified_communications_manager_im_and_presence_serviceVulnerable target · 2 assertions
Any version (unconstrained) (>= 12.5, < 14su5); Any version (unconstrained) (>= 15.0, <= 15su3a)Canonical identity product-af54064616436918152b25d3aa8cc91d7566bd424c558855054253dd74bbec4dLinked exact
Scope supported
Inspect raw assertions
  1. cpe:2.3:a:cisco:unified_communications_manager_im_and_presence_service:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 4
    Logic
    OR
    Version bounds
    from including 12.5; through excluding 14su5
    Match ID
    1235d0e6-5703-4dab-8d50-0dbef7a9a1eb
  2. cpe:2.3:a:cisco:unified_communications_manager_im_and_presence_service:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 5
    Logic
    OR
    Version bounds
    from including 15.0; through including 15su3a
    Match ID
    ef732c27-6f22-4987-bced-b7303e8f9789
NVD CPE · APPLICATIONciscounity_connectionVulnerable target · 2 assertions
Any version (unconstrained) (>= 12.5, < 14su5); Any version (unconstrained) (>= 15.0, <= 15su3)Canonical identity product-946e924c518c93825c79dee937d0abf238e8ccf046ab0f6d70817bd78f5a8b6eLinked exact
Scope supported
Inspect raw assertions
  1. cpe:2.3:a:cisco:unity_connection:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 6
    Logic
    OR
    Version bounds
    from including 12.5; through excluding 14su5
    Match ID
    8cd37f03-3690-4c47-9768-06eb00f693ab
  2. cpe:2.3:a:cisco:unity_connection:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 7
    Logic
    OR
    Version bounds
    from including 15.0; through including 15su3
    Match ID
    fd7bf042-4261-4f93-913d-d7b756f975cd

Affected-product evidence

Accepted scope and product mapping

3 canonical links · 1 source-reported links

Mapping establishedEvidence supported

vendor-0774b265c0e837e737aaf99ed0f2450c048e61f34267ca59d8623878b839334e · product-54fee77d40dd7771ad0e84af29bd7f6cdcf7db09a6aaa9bb1b2b75a1aa9f75f3

Source class
Nvd cpe vulnerable target
Assertions
4
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
4ca176a8-161c-4b6c-b89d-6bdec3acf62cc6d9e892-23aa-479b-9f67-cd1353ac8af6f144103e-1f1c-460e-aa3a-d465e832c72ff4e5e07d-69d8-42eb-8c1a-689ee9fddbf7
Mapping establishedEvidence supported

vendor-0774b265c0e837e737aaf99ed0f2450c048e61f34267ca59d8623878b839334e · product-946e924c518c93825c79dee937d0abf238e8ccf046ab0f6d70817bd78f5a8b6e

Source class
Nvd cpe vulnerable target
Assertions
2
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
dd4b4318-b6dd-4b03-9410-d51278e036d6fd4de744-1de0-4ae9-9e29-e0852253628d
Mapping establishedEvidence supported

vendor-0774b265c0e837e737aaf99ed0f2450c048e61f34267ca59d8623878b839334e · product-af54064616436918152b25d3aa8cc91d7566bd424c558855054253dd74bbec4d

Source class
Nvd cpe vulnerable target
Assertions
2
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
0e1f6c55-7a1e-4fd4-b227-820a5d294604bc8d9235-9671-4387-ba05-74a14774a3c6
Source-reported scopeSource-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Vendor specified only by source · Product specified only by source

Source class
Direct cve affected
Assertions
3
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
3a89f66b-cbb9-4c28-b149-3e7d94e8ebf25ec841f0-b2a1-43a5-a05d-37d74c27d057af3b57c1-ab31-431e-ba7d-fc173874ca03

Assessments

CVSS by origin

9.8
NVDCVSS 3.1 · role Primary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.2
psirt@cisco.comCVSS 3.1 · role Secondary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
8.2
ciscoCVSS 3.1 · role unknown · display onlyDirect record assessment retained outside normalized eligibilityCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Direct CVE/CNA normalized decisions

8.2Priority eligible

cisco

CVSS 3.1 · Primary · Original assertion · rank 1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Validation
Valid match
Recomputed
8.2
Decision reason
Evidence supported
Policy
casca-direct-cvss-eligibility-v1

Assessments are retained side by side under closed precedence. Cascade never averages CVSS.

Evidence boundaries

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; remaining scope stays source-scoped.
  • NVD-carried upstream facts remain derivative; independent corroboration requires a separately authored source.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.
  • OSV aggregation and OSV-converted NVD material are not independent corroboration.
  • Red Hat facts are vendor assertions for the exact supplied products.
  • Nonmembership and not-yet-observed states are not proof of safety.