CVE-2025-36520: A null pointer dereference vulnerability exists in the net_connectmsg Protocol Buffer Message functionality of

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HIGH 7.5REMOTEDOWNGRADE

CVE-2025-36520 is a high-severity flaw (CVSS 7.5) affecting comdb2. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A null pointer dereference vulnerability exists in the net_connectmsg Protocol Buffer Message functionality of Bloomberg Comdb2 8.1. A specially crafted network packets can lead to a denial of service. An attacker can send packets to trigger this vulnerability.

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	0.9% (top 40%)
CISA exploited list	No
Weakness	CWE-476
Published	2025-07-22
Last modified	2026-06-17

Publisher (CNA): Talos · Vendor: bloomberg

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

Am I affected?

Timeline

2025-07-22 16:15 UTCPublished CVE record published
2026-06-17 09:14 UTCUpdated Record last modified

bloomberg comdb2 DOWNGRADE

Affected: 8.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.1

1. Check installed version

apt-cache policy comdb2 || rpm -q comdb2 || comdb2 --version

2. No fixed release: DOWNGRADE to a release before 8.1 (Debian / Ubuntu)

apt-cache madison comdb2 sudo apt install comdb2=<VERSION_BEFORE_8.1> sudo apt-mark hold comdb2

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

dnf --showduplicates list comdb2 sudo dnf downgrade comdb2-<VERSION_BEFORE_8.1> sudo dnf versionlock add comdb2

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-2025-36520?

comdb2: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-36520 being exploited?

CVE-2025-36520 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-2025-36520 affect?

CVE-2025-36520 affects comdb2. Severity is high (CVSS 7.5). A null pointer dereference vulnerability exists in the net_connectmsg Protocol Buffer Message functionality of Bloomberg Comdb2 8.1. A specially crafted network packets can lead to a denial of service. An attacker can send packets to trigge

How urgent is CVE-2025-36520?

Priority 51/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

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CVE-2025-36512 HIGH 7.5 DOWNGRADE A denial of service vulnerability exists in the Bloomberg Comdb2 8.1 database when handling a distributed tran
CVE-2025-35966 HIGH 7.5 DOWNGRADE A null pointer dereference vulnerability exists in the CDB2SQLQUERY protocol buffer message handling of Bloomb

References

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