CVE-2025-36520Public exploitNetwork attack vector

Database-node crash via unchecked Protocol Buffer decode

Published Jul 22, 2025 · Updated Nov 3, 2025

NULL pointer dereference in Bloomberg Comdb2 8.1 allows remote attackers to crash a database node with a malformed connection message. The process_connect_message_proto function uses the result of net_connectmsg__unpack without checking for NULL before reading its fields. Any attacker who can reach a database node's assigned TCP port can send the seven-byte malformed Protocol Buffer message and terminate that server process.

CVSS severity7.5
High
EPSS probability0.88%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Bloomberg Comdb2 8.1 allows remote attackers to crash a database node with a malformed connection message. The process_connect_message_proto function uses the result of net_connectmsg__unpack without checking for NULL before reading its fields. Any attacker who can reach a database node's assigned TCP port can send the seven-byte malformed Protocol Buffer message and terminate that server process.

The record

CVE
CVE-2025-36520
Published
Jul 22, 2025
Updated
Nov 3, 2025
Vendor
Bloomberg L.P.
Product
Comdb2
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 22, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=8.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Bloomberg L.P. · Comdb2version=8.1

Published CVSS scores

7.5Cisco TalosCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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