CASCACascade Atlas

Evidence dossier

CVE-2017-18368

The ZyXEL P660HN-T1A v1 TCLinux Fw $7.3.15.0 v001 / 3.40(ULM.0)b31 router distributed by TrueOnline has a command injection vulnerability in the Remote System Log forwarding…

Exploited in the wild (CISA KEV since Aug 7, 2023). NVD reports CVSS 3.1 9.8. EPSS estimates 94.4% exploit likelihood as of Aug 26, 2026.

88.7–89.7Priority evidence range
Evidence current through Aug 27, 2026, 6:09 PM UTC

As of Aug 27, 2026

Normalized restatement

The ZyXEL P660HN-T1A v1 TCLinux Fw $7.3.15.0 v001 / 3.40(ULM.0)b31 router distributed by TrueOnline has a command injection vulnerability in the Remote System Log forwarding function, which is accessible by an unauthenticated user. The vulnerability is in the ViewLog.asp page and can be exploited through the remote_host parameter.

State
PUBLISHED
Published
May 2, 2019
Updated
Oct 21, 2025
Evidence coverage
96%

Evidence chronology

What was known when

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  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
    CVE Program

    Record text: CVE Program Container

    Inspect raw assertion
    Field
    container
    Value
    CVE Program Container
    Original evidence ↗
  3. Source dateSource date omittedFirst observed by CASCA
    mitre

    Record text: The ZyXEL P660HN-T1A v1 TCLinux Fw $7.3.15.0 v001 / 3.40(ULM.0)b31 router distributed by TrueOnline has a command injection vulnerability in the Remote System Log forwarding function, which is accessible by an unauthenticated user. The vulnerability is in the ViewLog.asp page and can be exploited through the remote_host parameter.

    Inspect raw assertion
    Field
    container
    Value
    The ZyXEL P660HN-T1A v1 TCLinux Fw $7.3.15.0 v001 / 3.40(ULM.0)b31 router distributed by TrueOnline has a command injection vulnerability in the Remote System Log forwarding function, which is accessible by an unauthenticated user. The vulnerability is in the ViewLog.asp page and can be exploited through the remote_host parameter.
    Original evidence ↗
  4. Source dateFirst observed by CASCA
    CISA KEV

    Exploitation cataloged: Zyxel P660HN-T1A Routers Command Injection Vulnerability

    Inspect raw assertion
    Field
    observed_exploitation
    Value
    Zyxel P660HN-T1A Routers Command Injection Vulnerability
    Original evidence ↗
  5. Source dateFirst observed by CASCA
    FIRST EPSS

    EPSS score: 94.43% probability · 99.84th percentile

    Inspect raw assertion
    Field
    model_probability
    Value
    Probability 0.944250000000; percentile 0.998440000000
    Original evidence ↗
ExploitationCatalog member

CISA KEV · catalog date Aug 7, 2023 · first observed Jul 19, 2026

Exploit likelihood94.42%

FIRST EPSS · score date Aug 26, 2026 · 99.8th percentile · first observed Aug 26, 2026

SeverityCVSS 9.8

NVD · CVSS 3.1 · first observed Jul 19, 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-ADPIndependent enrichment
Record text

CISA ADP Vulnrichment

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

CVE Program Container

Inspect raw assertion
Field
container
Value
CVE Program Container
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
mitreOriginal assertion
Record text

The ZyXEL P660HN-T1A v1 TCLinux Fw $7.3.15.0 v001 / 3.40(ULM.0)b31 router distributed by TrueOnline has a command injection vulnerability in the Remote System Log forwarding function, which is accessible by an unauthenticated user. The vulnerability is in the ViewLog.asp page and can be exploited through the remote_host parameter.

Inspect raw assertion
Field
container
Value
The ZyXEL P660HN-T1A v1 TCLinux Fw $7.3.15.0 v001 / 3.40(ULM.0)b31 router distributed by TrueOnline has a command injection vulnerability in the Remote System Log forwarding function, which is accessible by an unauthenticated user. The vulnerability is in the ViewLog.asp page and can be exploited through the remote_host parameter.
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
CISA KEVOriginal assertion
Exploitation cataloged

Zyxel P660HN-T1A Routers Command Injection Vulnerability

Inspect raw assertion
Field
observed_exploitation
Value
Zyxel P660HN-T1A Routers Command Injection Vulnerability
Source dateFirst observed by CASCAOriginal evidence ↗
FIRST EPSSOriginal assertion
EPSS score

94.43% probability · 99.84th percentile

Inspect raw assertion
Field
model_probability
Value
Probability 0.944250000000; percentile 0.998440000000
Source dateFirst observed by CASCAOriginal evidence ↗

Applicability

Cited product scope

Trace impact →
6Underlying assertions
6Canonical products
3Target assertions
3Constraint assertions

Grouped from 6 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

7 scope groups

mitre · source assertedn/an/aDirect source scope
Affected: n/a
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "n/a"}]
NVD CPE · HARDWAREbillion5200w-tEnvironmental constraint · 1 assertions
Version not applicableCanonical identity product-6781e6119668626ad1f7d707aa7f5e418c52ea824845d0ac965234b446ec2f0aLinked exact
Scope constrained
Inspect raw assertion
  1. cpe:2.3:h:billion:5200w-t:-:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Environmental constraint
    Configuration
    0 · node/1 · match 0
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    b8f97c92-c53d-4578-92ed-9327e3646fdb
NVD CPE · OPERATING SYSTEMbillion5200w-t_firmwareVulnerable target · 1 assertions
Version 7.3.8.0Canonical identity product-acf43990544892bf56348f79a81dced61e8c24c81d747129655df76f38ecb4feLinked exact
Scope supported
Inspect raw assertion
  1. cpe:2.3:o:billion:5200w-t_firmware:7.3.8.0:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 0
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    c756e02f-45b7-4f40-aeec-dcc334023f8b
NVD CPE · HARDWAREzyxelp660hn-t1a_v1Environmental constraint · 1 assertions
Version not applicableCanonical identity product-014ac709e5f84349e0fa2f5bc97f08ca335c77466b5ff05367e3e2ca7a0b1642Linked exact
Scope constrained
Inspect raw assertion
  1. cpe:2.3:h:zyxel:p660hn-t1a_v1:-:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Environmental constraint
    Configuration
    2 · node/1 · match 0
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    3af29b50-0ae2-444c-a251-c27debdc064b
NVD CPE · OPERATING SYSTEMzyxelp660hn-t1a_v1_firmwareVulnerable target · 1 assertions
Version 7.3.15.0Canonical identity product-216812ab8acaa7eeb19cd7b4b60c271313fa1bea26d93b822dd21a857c699ab2Linked exact
Scope supported
Inspect raw assertion
  1. cpe:2.3:o:zyxel:p660hn-t1a_v1_firmware:7.3.15.0:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    2 · node/0 · match 0
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    bb423d04-654a-4fd5-8973-17e5b08c7453
NVD CPE · HARDWAREzyxelp660hn-t1a_v2Environmental constraint · 1 assertions
Version not applicableCanonical identity product-e6aaed3e6687c823f35268520b882586a19f670c580a80211f94447c30c27e17Linked exact
Scope constrained
Inspect raw assertion
  1. cpe:2.3:h:zyxel:p660hn-t1a_v2:-:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Environmental constraint
    Configuration
    1 · node/1 · match 0
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    1c6d563a-3210-4459-be4d-5cc36caf6784
NVD CPE · OPERATING SYSTEMzyxelp660hn-t1a_v2_firmwareVulnerable target · 1 assertions
Version 7.3.15.0Canonical identity product-b3998867d921d437be74d0f7b9f8ed7b299d5d77273cc2eeed61c42c42d06f6aLinked exact
Scope supported
Inspect raw assertion
  1. cpe:2.3:o:zyxel:p660hn-t1a_v2_firmware:7.3.15.0:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    1 · node/0 · match 0
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    345e3d41-af56-47da-9719-e84fb9db300b

Affected-product evidence

Accepted scope and product mapping

3 canonical links · 1 source-reported links

Mapping establishedEvidence supported

vendor-b18047daaf1c9692aefa2edb7182e0b8d93a7a346ff6d96ee9c363ca18b9f5cc · product-216812ab8acaa7eeb19cd7b4b60c271313fa1bea26d93b822dd21a857c699ab2

Source class
Nvd cpe vulnerable target
Assertions
1
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
6b4aaaf4-e22c-4b1d-b85a-20569c8d15d7
Mapping establishedEvidence supported

vendor-fdc5281a2250c6a24624ba294ca7e08b284e74cbeba0be95cc365e78924cca15 · product-acf43990544892bf56348f79a81dced61e8c24c81d747129655df76f38ecb4fe

Source class
Nvd cpe vulnerable target
Assertions
1
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
50514c6b-17f7-4568-95db-9ba6781b89bd
Mapping establishedEvidence supported

vendor-b18047daaf1c9692aefa2edb7182e0b8d93a7a346ff6d96ee9c363ca18b9f5cc · product-b3998867d921d437be74d0f7b9f8ed7b299d5d77273cc2eeed61c42c42d06f6a

Source class
Nvd cpe vulnerable target
Assertions
1
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
bc66d4c6-4e23-490c-b3a3-f744924c55d7
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
1
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
ab078512-6b06-4eb7-a686-1a5fad414f9a

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
10.0
NVDCVSS 2.0 · role Primary · priority eligiblevalid_matchAV:N/AC:L/Au:N/C:C/I:C/A:C
9.8
CVE Program sourceCVSS 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
9.8
CISA-ADPCVSS 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

Direct CVE/CNA normalized decisions

9.8Priority eligible

CISA-ADP

CVSS 3.1 · Secondary · Independent enrichment · rank 2

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Validation
Valid match
Recomputed
9.8
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.