CVE-2026-5691
CVE-2026-5691 is a high-severity vulnerability with a CVSS 3.x base score of 7.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-77.
Key facts
- Severity: High (CVSS 3.x base score 7.3)
- CVSS v2: 7.5
- CVSS v4: 5.5
- EPSS exploit prediction: 1% (64th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-19555
- Weakness: CWE-77
- Published:
- Last modified:
Description
A vulnerability has been found in Totolink A7100RU 7.4cu.2313_b20191024. This affects the function setFirewallType of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument firewallType leads to os command injection. The attack is possible to be carried out remotely. The exploit has been disclosed to the public and may be used.
Frequently asked questions
- What is CVE-2026-5691?
- A vulnerability has been found in Totolink A7100RU 7.4cu.2313_b20191024. This affects the function setFirewallType of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument firewallType leads to os command injection. The attack is possible to be carried out remotely. The exploit has been disclosed to the public and may be used.
- How severe is CVE-2026-5691?
- CVE-2026-5691 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
- Is CVE-2026-5691 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-5691?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2026-5691 have an EU (EUVD) identifier?
- Yes. CVE-2026-5691 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19555.
- When was CVE-2026-5691 published?
- CVE-2026-5691 was published on 2026-04-06 and last updated on 2026-06-17.
References
- https://github.com/Litengzheng/vuldb_new/blob/main/A7100RU/vul_189/README.md
- https://vuldb.com/submit/792962
- https://vuldb.com/vuln/355518
- https://vuldb.com/vuln/355518/cti
- https://www.totolink.net/
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