CVE-2023-27135
RCE in Totolink A7100Ru Firmware 7.4cu.2313_b20191024
Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HCVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.
Summary
CVE-2023-27135 is a critical-severity Command Injection (CWE-77) vulnerability in Totolink A7100Ru Firmware. Its CVSS base score is 9.8 (Critical).
Operationally, ranked in the top 19% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
CVE-2023-27135 is a command injection vulnerability in the TOTOLINK A7100RU wireless router running firmware version V7.4cu.2313_B20191024. The flaw resides in the web management interface at the endpoint /setting/setWanIeCfg, where the “enabled” parameter is processed without adequate sanitization, allowing arbitrary operating-system commands to be executed under the web-server process.
An unauthenticated attacker with network access can supply a crafted HTTP request containing shell metacharacters in the enabled field. Successful exploitation grants the attacker the ability to read, modify, or delete arbitrary files, create new accounts, or pivot further into attached networks, corresponding to the CVSS 9.8 rating that reflects no required credentials or user interaction.
Public references consist of proof-of-concept material hosted on GitHub that demonstrates the injection vector. No vendor advisory or firmware patch is referenced in the available sources.
The EPSS score for this CVE rose from a low baseline to a peak of 0.3113 on 2025-01-22 before receding to the current value of 0.0516, indicating a measurable increase in observed exploitation interest well after the original disclosure.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-30919
Vulnerability Data
TOTOlink A7100RU V7.4cu.2313_B20191024 was discovered to contain a command injection vulnerability via the enabled parameter at /setting/setWanIeCfg.
- CWE(s)
Related Threats
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.
A.8.25 mandates secure SDLC practices including secure coding guidelines, security requirements, checkpoints, testing (scans/penetration), and developer training that reduce command injection defects, but leaves a minority slice (e.g. incomplete implementation of those practices, outsourced development without full assurance, or post-SDLC changes) where the weakness can still arise and be exploitable.
Application security requirements explicitly call for controls against injection flaws including command injection.
A.8.27 mandates security-by-design principles (e.g. distrust external input, secure session control, data validation/sanitization, least privilege) and design reviews that can stop command injection from being introduced, but this is only a minority slice of CWE-77 because the weakness can still arise in code that bypasses those principles, in non-reviewed components, or in runtime injection vectors the architecture review does not reach.
Secure coding standards require proper escaping and parameterization of commands, directly eliminating CWE-77.
Security testing in development catches command-injection vulnerabilities before release.
Hardening callouts derived
DISA STIG baselines are authored against specific weaknesses. Where this CVE cites a broad weakness class, the mapping is not asserted at that abstraction (owner ruling, 2026-09-25: grade only at Base and below), so no rule is shown here rather than a rule shown against the wrong grain.
- No fine-grained STIG row for CWE-77, a class-level weakness, and none of its children carries one either.