Linksys WRT54GL Traceroute Diagnostic Function apply.cgi system os command injection
CVSS score
9.4
EPSS probability
—
Risk score
0.9
Published
3 h ago
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Impact on My Inventory
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Vulnerability description
DayBreach AI Explanation
Verified against sourcesSources read
1
Source agreement
Tam uyum
Evidence confidence
%55
Short explanation
A security vulnerability has been detected in Linksys WRT54GL 4.30.18 affecting the system function of the apply.cgi file within the Traceroute Diagnostic Function component. This flaw leads to OS command injection and can be launched remotely.
This critical vulnerability allows remote attacks and poses additional risks because the affected product is no longer supported by the maintainer.
What should be done?
- Follow vendor advisories
- Evaluate alternative mitigations given the product is unsupported
Chain of evidence and sources
Linksys WRT54GL 4.30.18 sürümünde Traceroute Diagnostic Function içerisindeki apply.cgi dosyasında işletim sistemi komut enjeksiyonu zafiyeti bulunmaktadır.
Zafiyet uzaktan tetiklenebilmekte olup istismarı halka açık şekilde paylaşılmıştır.
Etkilenen ürün artık üretici veya bakım sağlayıcı tarafından desteklenmemektedir.
Show the technical text from the sources
A security vulnerability has been detected in Linksys WRT54GL 4.30.18. The impacted element is the function system of the file apply.cgi of the component Traceroute Diagnostic Function. Such manipulation of the argument traceroute_ip leads to os command injection. The attack can be launched remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way. This vulnerability only affects products that are no longer supported by the maintainer.
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
CWE: CWE-78, CWE-77
This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-121931 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | linksys | wrt54gl | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 9.4 | CVSS V4_0 | CRITICAL | 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 | CVE CNA |
| 9.1 | CVSS V3_1 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:C | CVE CNA |
| 9.1 | CVSS V3_0 | CRITICAL | CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:C | CVE CNA |
| 9.1 | CVSS V31 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H | NVD |
| 8.5 | CVSS V40 | HIGH | 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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | NVD |
| 8.3 | CVSS V2_0 | — | AV:N/AC:L/Au:M/C:C/I:C/A:C/E:POC/RL:ND/RC:C | CVE CNA |
| 8.3 | CVSS V2 | — | AV:N/AC:L/Au:M/C:C/I:C/A:C | NVD |
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-121931 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-121931 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
Similar Vulnerabilities
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