Is there a public exploit for CVE-2026-121943?

No public exploit for CVE-2026-121943 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-121943?

CVE-2026-121943 scores CVSS 6.3 (v4.0), rated medium.

What does CVE-2026-121943 affect?

CVE-2026-121943 affects irontec sngrep.

6.3 Medium

Irontec sngrep through 1.9.0 contains an out-of-bounds stack read vulnerability in sipcheckpacket and sipvalidatepacket caused by an…

CVE-2026-121943

Irontec sngrep through 1.9.0 contains an out-of-bounds stack read vulnerability in sipcheckpacket and sipvalidatepacket caused by an off-by-one length check on 10240-byte SIP payloads. Remote attackers can send a crafted UDP or TCP SIP packet or supply a pcap file to crash sngrep or leak adjacent stack bytes into displayed SIP fields.

Assessment

CVSS: 6.3 (v4.0)
Severity: Medium
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 4 November 2026
Last updated: 4 November 2026
Affected: irontec · sngrep
Assigner: VulnCheck

CVSS vectorCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N

At the source

EUVD (ENISA)

References

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