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Ubuntu 20.04 LTS: Critical Denial of Service Patch for Squid USN-7804-2

ubuntu
Calendar Grey November 4, 2025
Dist Ubuntu Esm H88
Squid update for Ubuntu addresses denial of service risk from crafted traffic. Important updates available for LTS versions.
Squid could be made to crash if it received specially crafted network traffic.

Summary

Squid could be made to crash if it received specially crafted network

traffic.

Software Description:

- squid: Web proxy cache server

- squid3: Web proxy cache server

Details:

USN-7804-1 fixed a vulnerability in Squid. This update provides the

corresponding update for Ubuntu 16.04 LTS, Ubuntu 18.04 LTS and Ubuntu

20.04 LTS.

Original advisory details:

It was discovered that Squid incorrectly handled certain long SNMP OIDs. A

remote attacker could possibly use this issue to cause Squid to crash,

resulting in a denial of service.

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu important system update squid

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.04 LTS
  squid                           4.10-1ubuntu1.13+esm2
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  squid                           3.5.27-1ubuntu1.14+esm5
                                  Available with Ubuntu Pro
  squid3                          3.5.27-1ubuntu1.14+esm5
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  squid                           3.5.12-1ubuntu7.16+esm6
                                  Available with Ubuntu Pro
  squid3                          3.5.12-1ubuntu7.16+esm6
                                  Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-7804-2

https://ubuntu.com/security/notices/USN-7804-1

CVE-2025-59362

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7804-2

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu important system update squid

Package Information

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