CVE-2025-50681: igmpproxy 0.4 before commit 2b30c36 allows remote attackers to cause a denial of service (application crash) v

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HIGH 7.5REMOTEDOWNGRADE

CVE-2025-50681 is a high-severity flaw (CVSS 7.5) affecting igmpproxy. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

igmpproxy 0.4 before commit 2b30c36 allows remote attackers to cause a denial of service (application crash) via a crafted IGMPv3 membership report packet with a malicious source address. Due to insufficient validation in the `recv_igmp()` function in src/igmpproxy.c, an invalid group record type can trigger a NULL pointer dereference when logging the address using `inet_fmtsrc()`. This vulnerability can be exploited by sending malformed multicas

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-120
Published	2025-12-19
Last modified	2026-10-13

Publisher (CNA): MITRE · Vendor: pali

Last updated 2026-10-13 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-19 15:15 UTCPublished CVE record published
2026-10-13 11:10 UTCUpdated Record last modified

pali igmpproxy DOWNGRADE

Affected: 0.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.4

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.4 (Debian / Ubuntu)

apt-cache madison igmpproxy sudo apt install igmpproxy=<VERSION_BEFORE_0.4> sudo apt-mark hold igmpproxy

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list igmpproxy sudo dnf downgrade igmpproxy-<VERSION_BEFORE_0.4> sudo dnf versionlock add igmpproxy

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-2025-50681?

igmpproxy: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-50681 being exploited?

CVE-2025-50681 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-2025-50681 affect?

CVE-2025-50681 affects igmpproxy. Severity is high (CVSS 7.5). igmpproxy 0.4 before commit 2b30c36 allows remote attackers to cause a denial of service (application crash) via a crafted IGMPv3 membership report packet with a malicious source address. Due to insufficient validation in the `recv_igmp()`

How urgent is CVE-2025-50681?

Priority 47/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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