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VulnerabilityPublished

CVE-2025-43979: OS Command Injection

Source CVE Database V5

0

Not known to be exploited · CVSS 7.4 High.

Data as of 26 Oct 2026, 09:15 UTC

CVSS 3.1 base score
7.4High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
6.4% chance of exploitation in 30 days – higher than 93% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 5 Aug 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

AI-suggested

Organizations should immediately audit their networks to identify any FIRSTNUM JC21A-04 devices and assess their firmware versions. Until patches are available, restrict access to the xml_action.cgi endpoint by implementing strict network segmentation and firewall rules to limit access only to trusted administrators. Enforce strong authentication mechanisms and monitor authentication logs for suspicious activity. Employ intrusion detection systems to flag unusual command execution patterns or unexpected traffic to the vulnerable endpoint. Consider disabling or restricting the vulnerable CGI endpoint if possible. Additionally, implement compensating controls such as network-level anomaly detection and enhanced logging to detect exploitation attempts. Engage with the vendor for timeline on patches and apply updates promptly once available. Regularly review device configurations and conduct penetration testing focused on this vulnerability.

Description

An issue was discovered on FIRSTNUM JC21A-04 devices through 2.01ME/FN that allows authenticated attackers to execute arbitrary OS system commands with root privileges via crafted payloads to the xml_action.cgi?method= endpoint.

References

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