CVE-2026-7156
CVE-2026-7156 is a critical-severity vulnerability with a CVSS 3.x base score of 9.8. 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: Critical (CVSS 3.x base score 9.8)
- CVSS v2: 10.0
- CVSS v4: 8.9
- EPSS exploit prediction: 2% (76th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-25923
- Weakness: CWE-77
- Published:
- Last modified:
Description
A vulnerability was detected in Totolink A8000RU 7.1cu.643_b20200521. Affected is the function CsteSystem of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. The manipulation of the argument HTTP results in os command injection. The attack may be launched remotely. The exploit is now public and may be used.
Frequently asked questions
- What is CVE-2026-7156?
- A vulnerability was detected in Totolink A8000RU 7.1cu.643_b20200521. Affected is the function CsteSystem of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. The manipulation of the argument HTTP results in os command injection. The attack may be launched remotely. The exploit is now public and may be used.
- How severe is CVE-2026-7156?
- CVE-2026-7156 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-2026-7156 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-7156?
- 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-2026-7156 have an EU (EUVD) identifier?
- Yes. CVE-2026-7156 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25923.
- When was CVE-2026-7156 published?
- CVE-2026-7156 was published on 2026-04-27 and last updated on 2026-06-17.
References
- https://github.com/Litengzheng/vuldb_new2/blob/main/A8000RU/vul_320/README.md
- https://vuldb.com/submit/801142
- https://vuldb.com/vuln/359755
- https://vuldb.com/vuln/359755/cti
- https://www.totolink.net/
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