CVE-2020-24606

What it is

Squid before 4.13 and 5.x before 5.0.4 allows a trusted peer to perform Denial of Service by consuming all available CPU cycles during handling of a crafted Cache Digest response message. This only occurs when cache_peer is used with the cache digests feature. The problem exists because peerDigestHandleReply() livelocking in peer_digest.cc mishandles EOF.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

4.6% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2020-08-24 18:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 03:05 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 4.6% in the next 30 days (EPSS).
• Severity: 8.6 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2020-08-24 18:15 UTC

Last modified

2026-06-17 03:05 UTC

Exploit probability

4.6% · EPSS, next 30 days

Weakness

CWE-667

Record status

Modified

Affected

• squid-cache Squid < 4.13
• squid-cache Squid < 5.0.4
• Canonical Ubuntu Linux 16.04
• Canonical Ubuntu Linux 18.04
• Canonical Ubuntu Linux 20.04
• Debian Linux 9.0
• Debian Linux 10.0
• Fedoraproject Fedora 31

Attack profile CVSS 3.1 · 8.6

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2020-24606.md and follow it. Check whether this project is affected by CVE-2020-24606. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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