CVE-2026-7243
CVE-2026-7243 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% (82nd percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-26016
- Weakness: CWE-77
- Published:
- Last modified:
Description
A vulnerability was identified in Totolink A8000RU 7.1cu.643_b20200521. The affected element is the function setRadvdCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. The manipulation of the argument maxRtrAdvInterval leads to os command injection. It is possible to initiate the attack remotely. The exploit is publicly available and might be used.
Frequently asked questions
- What is CVE-2026-7243?
- A vulnerability was identified in Totolink A8000RU 7.1cu.643_b20200521. The affected element is the function setRadvdCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. The manipulation of the argument maxRtrAdvInterval leads to os command injection. It is possible to initiate the attack remotely. The exploit is publicly available and might be used.
- How severe is CVE-2026-7243?
- CVE-2026-7243 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-2026-7243 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-7243?
- 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-2026-7243 have an EU (EUVD) identifier?
- Yes. CVE-2026-7243 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26016.
- When was CVE-2026-7243 published?
- CVE-2026-7243 was published on 2026-04-28 and last updated on 2026-06-17.
References
- https://github.com/Litengzheng/vuldb_new2/blob/main/A8000RU/vul_327/README.md
- https://vuldb.com/submit/803266
- https://vuldb.com/vuln/359850
- https://vuldb.com/vuln/359850/cti
- https://www.totolink.net/
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