CVE-2026-7140
CVE-2026-7140 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% (75th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-25879
- Weakness: CWE-77
- Published:
- Last modified:
Description
A vulnerability has been found in Totolink A8000RU 7.1cu.643_b20200521. Impacted is the function CsteSystem of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Such manipulation of the argument HTTP leads to os command injection. The attack may be performed from remote. The exploit has been disclosed to the public and may be used.
Frequently asked questions
- What is CVE-2026-7140?
- A vulnerability has been found in Totolink A8000RU 7.1cu.643_b20200521. Impacted is the function CsteSystem of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Such manipulation of the argument HTTP leads to os command injection. The attack may be performed from remote. The exploit has been disclosed to the public and may be used.
- How severe is CVE-2026-7140?
- CVE-2026-7140 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-2026-7140 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-7140?
- 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-2026-7140 have an EU (EUVD) identifier?
- Yes. CVE-2026-7140 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25879.
- When was CVE-2026-7140 published?
- CVE-2026-7140 was published on 2026-04-27 and last updated on 2026-06-17.
References
- https://github.com/Litengzheng/vuldb_new2/blob/main/A8000RU/vul_315/README.md
- https://vuldb.com/submit/801110
- https://vuldb.com/vuln/359739
- https://vuldb.com/vuln/359739/cti
- https://www.totolink.net/
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