CVE-2025-34049
CVE-2025-34049 is a critical-severity vulnerability with a CVSS 4.0 base score of 9.4. 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-78.
Key facts
- Severity: Critical (CVSS 4.0 base score 9.4)
- EPSS exploit prediction: 2% (82nd percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2025-19206
- Weakness: CWE-78
- Published:
- Last modified:
Description
An OS command injection vulnerability exists in the OptiLink ONT1GEW GPON router firmware version V2.1.11_X101 Build 1127.190306 and earlier. The router’s web management interface fails to properly sanitize user input in the target_addr parameter of the formTracert and formPing administrative endpoints. An authenticated attacker can inject arbitrary operating system commands, which are executed with root privileges, leading to remote code execution. Successful exploitation enables full compromise of the device. Exploitation evidence was observed by the Shadowserver Foundation on 2025-02-04 UTC.
Frequently asked questions
- What is CVE-2025-34049?
- An OS command injection vulnerability exists in the OptiLink ONT1GEW GPON router firmware version V2.1.11_X101 Build 1127.190306 and earlier. The router’s web management interface fails to properly sanitize user input in the target_addr parameter of the formTracert and formPing administrative endpoints. An authenticated attacker can inject arbitrary operating system commands, which are executed with root privileges, leading to remote code execution. Successful exploitation enables full compromise of the device. Exploitation evidence was observed by the Shadowserver Foundation on 2025-02-04 UTC.
- How severe is CVE-2025-34049?
- CVE-2025-34049 has a CVSS 4.0 base score of 9.4, rated critical severity.
- Is CVE-2025-34049 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-2025-34049?
- 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-2025-34049 have an EU (EUVD) identifier?
- Yes. CVE-2025-34049 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-19206.
- When was CVE-2025-34049 published?
- CVE-2025-34049 was published on 2025-06-26 and last updated on 2026-06-17.
References
- https://optilinknetwork.com/
- https://packetstorm.news/files/id/162993
- https://vulncheck.com/advisories/optilink-ont1gew-router-rce
- https://www.exploit-db.com/exploits/49955
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