CVE-2024-3120: A stack-buffer overflow vulnerability exists in all versions of sngrep since v1.4.1

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CRITICAL 9.0REMOTEUPGRADE

CVE-2024-3120 is a critical-severity flaw (CVSS 9.0) affecting sngrep. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A stack-buffer overflow vulnerability exists in all versions of sngrep since v1.4.1. The flaw is due to inadequate bounds checking when copying 'Content-Length' and 'Warning' headers into fixed-size buffers in the sip_validate_packet and sip_parse_extra_headers functions within src/sip.c. This vulnerability allows remote attackers to execute arbitrary code or cause a denial of service (DoS) via crafted SIP messages.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.0 (Critical)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.8% (top 21%)
CISA exploited list	No
Weakness	CWE-120, CWE-787
Published	2024-04-10
Last modified	2026-06-17

Publisher (CNA): Pentraze · Vendor: irontec

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-04-10 00:15 UTCPublished CVE record published
2026-06-17 07:43 UTCUpdated Record last modified

irontec sngrep UPGRADE

Affected: >= 1.4.1 and < 1.8.1

Fixed in: 1.8.1

Safe to downgrade to: a release before 1.4.1

1. Check installed version

apt-cache policy sngrep || rpm -q sngrep || sngrep --version

2. UPGRADE to 1.8.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade sngrep

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade sngrep

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 1.4.1 (Debian / Ubuntu)

apt-cache madison sngrep sudo apt install sngrep=<VERSION_BEFORE_1.4.1> sudo apt-mark hold sngrep

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list sngrep sudo dnf downgrade sngrep-<VERSION_BEFORE_1.4.1> sudo dnf versionlock add sngrep

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-3120?

sngrep: upgrade to 1.8.1. Exact commands for each OS are on this page.

Is CVE-2024-3120 being exploited?

CVE-2024-3120 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-3120 affect?

CVE-2024-3120 affects sngrep. Severity is critical (CVSS 9.0). A stack-buffer overflow vulnerability exists in all versions of sngrep since v1.4.1. The flaw is due to inadequate bounds checking when copying 'Content-Length' and 'Warning' headers into fixed-size buffers in the sip_validate_packet and si

How urgent is CVE-2024-3120?

Priority 56/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2024-3119 CRITICAL 9.0 UPGRADE A buffer overflow vulnerability exists in all versions of sngrep since v0.4.2, due to improper handling of 'Ca
CVE-2024-35434 HIGH 7.5 DOWNGRADE Irontec Sngrep v1.8.1 was discovered to contain a heap buffer overflow via the function rtp_check_packet at /s
CVE-2023-36192 HIGH 7.8 DOWNGRADE Sngrep v1.6.0 was discovered to contain a heap buffer overflow via the function capture_ws_check_packet at /sr
CVE-2023-31982 HIGH 7.8 DOWNGRADE Sngrep v1.6.0 was discovered to contain a heap buffer overflow via the function capture_packet_reasm_ip at /sr
CVE-2023-31981 HIGH 7.8 DOWNGRADE Sngrep v1.6.0 was discovered to contain a stack buffer overflow via the function packet_set_payload at /src/pa

References

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