CASCACascade Atlas

Evidence dossier

CVE-2024-55591

An Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] affecting FortiOS version 7.0.0 through 7.0.16 and FortiProxy version 7.0.0 through 7.0.19…

Exploited in the wild (CISA KEV since Jan 14, 2025). NVD reports CVSS 3.1 9.8. EPSS estimates 98.3% exploit likelihood as of Aug 8, 2026.

84.3–91.2Priority evidence range
Evidence current through Aug 27, 2026, 6:09 PM UTC

As of Aug 27, 2026

Normalized restatement

An Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] affecting FortiOS version 7.0.0 through 7.0.16 and FortiProxy version 7.0.0 through 7.0.19 and 7.2.0 through 7.2.12 allows a remote attacker to gain super-admin privileges via crafted requests to Node.js websocket module.

State
PUBLISHED
Published
Jan 14, 2025
Updated
Aug 5, 2026
Evidence coverage
85%

Evidence chronology

What was known when

Download this view's receipt →
  1. Source dateFirst observed by CASCA
    CISA KEV

    Exploitation cataloged: Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability

    Inspect raw assertion
    Field
    observed_exploitation
    Value
    Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability
    Original evidence ↗
  2. 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 ↗
  3. Source dateSource date omittedFirst observed by CASCA
    fortinet

    Record text: An Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] affecting FortiOS version 7.0.0 through 7.0.16 and FortiProxy version 7.0.0 through 7.0.19 and 7.2.0 through 7.2.12 allows a remote attacker to gain super-admin privileges via crafted requests to Node.js websocket module.

    Inspect raw assertion
    Field
    container
    Value
    An Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] affecting FortiOS version 7.0.0 through 7.0.16 and FortiProxy version 7.0.0 through 7.0.19 and 7.2.0 through 7.2.12 allows a remote attacker to gain super-admin privileges via crafted requests to Node.js websocket module.
    Original evidence ↗
  4. Source dateFirst observed by CASCA
    FIRST EPSS

    EPSS score: 98.26% probability · 99.91th percentile

    Inspect raw assertion
    Field
    model_probability
    Value
    Probability 0.982590000000; percentile 0.999120000000
    Original evidence ↗
ExploitationCatalog member

CISA KEV · catalog date Jan 14, 2025 · first observed Jul 19, 2026

Exploit likelihood98.26%

FIRST EPSS · score date Aug 8, 2026 · 99.9th percentile · first observed Aug 8, 2026

SeverityCVSS 9.8

NVD · CVSS 3.1 · first observed Aug 6, 2026 · same-version scores align in this snapshot

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 assessmentEvidence supported

Eligible evidence is present for this bounded claim.

Revision
casca-direct-cvss-eligibility-v1
Cutoff
Aug 27, 2026
Resolution
None
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 KEVOriginal assertion
Exploitation cataloged

Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability

Inspect raw assertion
Field
observed_exploitation
Value
Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability
Source dateFirst observed by CASCAOriginal evidence ↗
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 ↗
fortinetOriginal assertion
Record text

An Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] affecting FortiOS version 7.0.0 through 7.0.16 and FortiProxy version 7.0.0 through 7.0.19 and 7.2.0 through 7.2.12 allows a remote attacker to gain super-admin privileges via crafted requests to Node.js websocket module.

Inspect raw assertion
Field
container
Value
An Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] affecting FortiOS version 7.0.0 through 7.0.16 and FortiProxy version 7.0.0 through 7.0.19 and 7.2.0 through 7.2.12 allows a remote attacker to gain super-admin privileges via crafted requests to Node.js websocket module.
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
FIRST EPSSOriginal assertion
EPSS score

98.26% probability · 99.91th percentile

Inspect raw assertion
Field
model_probability
Value
Probability 0.982590000000; percentile 0.999120000000
Source dateFirst observed by CASCAOriginal evidence ↗

Applicability

Cited product scope

Trace impact →
3Underlying assertions
2Canonical products
3Target 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

4 scope groups

fortinet · source assertedFortinetFortiOSDirect source scope
Affected: 7.0.0 through 7.0.16 (semver comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "7.0.0", "versionType": "semver", "lessThanOrEqual": "7.0.16"}]
fortinet · source assertedFortinetFortiProxyDirect source scope
Affected: 7.2.0 through 7.2.12 (semver comparison)Affected: 7.0.0 through 7.0.19 (semver comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "7.2.0", "versionType": "semver", "lessThanOrEqual": "7.2.12"}, {"status": "affected", "version": "7.0.0", "versionType": "semver", "lessThanOrEqual": "7.0.19"}]
NVD CPE · OPERATING SYSTEMfortinetfortiosVulnerable target · 1 assertions
Any version (unconstrained) (>= 7.0.0, < 7.0.17)Canonical identity product-d06140244cc5e972beb67f7de823109a7332f0ff670c2c5c21938de936e3f496Linked exact
Scope supported
Inspect raw assertion
  1. cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 2
    Logic
    OR
    Version bounds
    from including 7.0.0; through excluding 7.0.17
    Match ID
    bd357034-b2fd-4c2e-97fe-2c54d686d885
NVD CPE · APPLICATIONfortinetfortiproxyVulnerable target · 2 assertions
Any version (unconstrained) (>= 7.0.0, < 7.0.20); Any version (unconstrained) (>= 7.2.0, < 7.2.13)Canonical identity product-53e2c632c140b04469e646fdc096d80536975303740dc515e32352dc87ed2607Linked exact
Scope supported
Inspect raw assertions
  1. cpe:2.3:a:fortinet:fortiproxy:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 1
    Logic
    OR
    Version bounds
    from including 7.2.0; through excluding 7.2.13
    Match ID
    edc18768-0891-465e-9900-3df5d22a5cb3
  2. cpe:2.3:a:fortinet:fortiproxy:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 0
    Logic
    OR
    Version bounds
    from including 7.0.0; through excluding 7.0.20
    Match ID
    1b14cd59-f557-48a0-8458-becd3ad7db3a

Affected-product evidence

Accepted scope and product mapping

0 canonical links · 2 source-reported links

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
2
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
711b4125-c2f9-4bf1-999f-cac7fd7238f6e0f6dab4-31c1-47ef-b40e-2b3e7150f69b
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
Nvd cpe vulnerable target
Assertions
3
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
2ae88005-5708-46f7-9a0d-7c287512a8a0c1491fdc-afeb-4cd3-848c-d4c4a6e0a4c1efb92136-87e1-4705-8876-06262a6130c5

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
9.8
psirt@fortinet.comCVSS 3.1 · role Secondary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.6
fortinetCVSS 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:H/A:H/E:H/RL:O/RC:C

Direct CVE/CNA normalized decisions

9.6Display only

fortinet

CVSS 3.1 · Primary · Original assertion · rank 1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C
Validation
Base mismatch
Recomputed
9.8
Decision reason
Outside current scoring policy
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.