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CVE-2026-121931

CVE-2026-121931

waiting for further signalsZero needs more public information before it can validate it.

EUVD-2026-117047 ↗

no check availablenot proven exploitable
cve.orgpublic pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).−25dkevAttacks confirmed in the real world.
Linksys WRT54GL 4.30.18
CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
ETK-2026-3532Zero's internal tracking ID, independent of the CVE number., permanent identifier
cvss9.4cna vendorCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P
1h 49msince last run
58mAI analysisAnalysis: how long the AI spent reversing this signal.
timeline
0 = trigger signal
public poc−25dtrigger signal (cve.org) +0dwaiting for further signals+0.1d
−20d
−15d
−10d
−5d

description

Linksys WRT54GL 4.30.18 is affected by OS command injection in the Traceroute Diagnostic Function. A remote attacker may execute operating-system commands by manipulating input to the diagnostic endpoint; the affected device must be reachable by the attacker.

mitigation

Remove affected WRT54GL devices from untrusted networks and disable or restrict access to the web administration and diagnostic interfaces. Replace unsupported devices with supported hardware, as no fixed version is recorded.

check
no
exploit
no
automationDeterministic: a check that runs on its own, the same request on every target. Contextual: an agentic technique that needs to be applied per target, for bugs that depend on contextual flows.
contextual
auth requiredWhether an attacker needs an account first, based on the CVSS vector's Privileges Required.
yes, high privileges
EPSSEstimate of the chance this CVE is exploited in the next 30 days. Refreshed daily.
–
agent run time
58m
cve.org record, t = 0The moment cve.org publishes the CVE in full.
2026-11-04 18:45Z
Δ to public pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).
−25d
Δ to kevAttacks confirmed in the real world.
–

outcome

Contextual, not validated: no deterministic check could cover this one, and no technique passed our review.

source signals

Public signals that triggered or updated the pipeline. These are inputs for the deltas above.

  1. 2026-11-04 18:45Z
    cve_org: trigger signal, started the run
    https://www.cve.org/CVERecord?id=CVE-2026-121931
  2. 2026-11-04 19:41Z

this entry in the feed

GET /api/v1/feed/CVE-2026-121931

{
  "etk_id": "ETK-2026-3532",
  "cve_id": "CVE-2026-121931",
  "display_id": "CVE-2026-121931",
  "ghsa_id": null,
  "euvd_id": "EUVD-2026-117047",
  "status": "published",
  "anchor_state": "anchored",
  "title": "OS command injection in Linksys WRT54GL diagnostics",
  "summary": "Linksys WRT54GL 4.30.18 is affected by OS command injection in the Traceroute Diagnostic Function. A remote attacker may execute operating-system commands by manipulating input to the diagnostic endpoint; the affected device must be reachable by the attacker.",
  "mitigation": "Remove affected WRT54GL devices from untrusted networks and disable or restrict access to the web administration and diagnostic interfaces. Replace unsupported devices with supported hardware, as no fixed version is recorded.",
  "vendor": "Linksys",
  "product": "WRT54GL",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "4.30.18"
      ],
      "ecosystem": null,
      "fixed_versions": [],
      "package_name": "WRT54GL",
      "purl": null
    }
  ],
  "cwes": [
    78
  ],
  "cvss_score": 9.4,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 57.8667585,
  "t0_at": "2026-11-04T18:45:14.398000+00:00",
  "signals": {
    "public_poc": {
      "at": "2026-10-11T01:57:49+00:00",
      "days": -24.699599513888888,
      "is_lower_bound": false,
      "measured_at": "2026-11-04T18:45:14.398000+00:00",
      "url": "https://github.com/Zimo-666/WRT54GL-cves"
    },
    "trigger_signal": {
      "at": "2026-11-04T18:45:14.398000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-11-04T18:45:14.398000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-121931"
    }
  }
}

published 2026-11-04 19:15Z
last change 2026-11-04 20:53Z

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