CVE-2026-5853
CVE-2026-5853 is a critical-severity vulnerability with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 14% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-77.
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- CVSS v2: 10.0
- CVSS v4: 8.9
- EPSS exploit prediction: 14% (96th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-20868
- Weakness: CWE-77
- Published:
- Last modified:
Description
A security vulnerability has been detected in Totolink A7100RU 7.4cu.2313_b20191024. Affected by this vulnerability is the function setIpv6LanCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Such manipulation of the argument addrPrefixLen leads to os command injection. The attack may be performed from remote. The exploit has been disclosed publicly and may be used.
Frequently asked questions
- What is CVE-2026-5853?
- A security vulnerability has been detected in Totolink A7100RU 7.4cu.2313_b20191024. Affected by this vulnerability is the function setIpv6LanCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Such manipulation of the argument addrPrefixLen leads to os command injection. The attack may be performed from remote. The exploit has been disclosed publicly and may be used.
- How severe is CVE-2026-5853?
- CVE-2026-5853 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2026-5853 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 14% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-5853?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- Does CVE-2026-5853 have an EU (EUVD) identifier?
- Yes. CVE-2026-5853 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20868.
- When was CVE-2026-5853 published?
- CVE-2026-5853 was published on 2026-04-09 and last updated on 2026-06-17.
References
- https://github.com/Litengzheng/vuldb_new/blob/main/A7100RU/vul_159/README.md
- https://vuldb.com/submit/791274
- https://vuldb.com/vuln/356379
- https://vuldb.com/vuln/356379/cti
- https://www.totolink.net/
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