CVE-2020-24606: canonical ubuntu_linux Improper Locking
Vulnerability summary
CVE-2020-24606 is a high (CVSS 8.6) Improper Locking vulnerability in canonical ubuntu_linux. EPSS estimates a 4.96% chance of exploitation in the next 30 days, higher than 92% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 14 · Related 9Timeline
- 24-08-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
6 scores · 5 sources · 2 versions- OSV · AlpineEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HDiffers
- OSV · UbuntuEcosystem advisory · calculated8.6HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HDiffers
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HDiffers
EPSS trend
Probability
4.96%
Chance of exploitation in the next 30 days
Percentile
92%
Versus all other CVEs
30-day change
-0.20 pp
From 5.16% on 18-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian2 products
- squid< 4.13-1
- debian_linuxEOL9.0 | 10.0
Ubuntu2 products
- squid< 4.10-1ubuntu1.2
- squid3< 3.5.12-1ubuntu7.15 | < 3.5.27-1ubuntu1.9
Alpine1 product
- squid≥ 3.0, < 4.13-r0 | ≥ 3.0, < 4.13.0-r0
Canonical1 product
- ubuntu_linuxEOL16.04 | 18.04 | 20.04
Fedoraproject1 product
- fedoraEOL31 | 32 | 33
Opensuse1 product
- leapEOL15.1 | 15.2
Squid-cache1 product
- squid≥ 3.0, < 4.13 | ≥ 5.0.1, < 5.0.4
7 vendors · 9 products
References
20 links- github.com/squid-cache/squid/security/advisories/GHSA-vvj7-xjgq-g2jgX Refsource MISCREPORTThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2020-09/msg00012.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2020-09/msg00017.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
Show all 20 references
- lists.debian.org/debian-lts-announce/2020/10/msg00005.htmlMailing ListX Refsource MLISTThird Party Advisory