CVE-2019-18676: canonical ubuntu_linux Out-of-bounds Write
Vulnerability summary
CVE-2019-18676 is a high (CVSS 7.5) Out-of-bounds Write vulnerability in canonical ubuntu_linux. EPSS estimates a 9.18% chance of exploitation in the next 30 days, higher than 95.2% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 13 · Related 9Timeline
- 26-11-2019PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
An issue was discovered in Squid 3.x and 4.x through 4.8. Due to incorrect input validation, there is a heap-based buffer overflow that can result in Denial of Service to all clients using the proxy. Severity is high due to this vulnerability occurring before normal security checks; any remote client that can reach the proxy port can trivially perform the attack via a crafted URI scheme.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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:H
EPSS trend
Probability
9.18%
Chance of exploitation in the next 30 days
Percentile
95%
Versus all other CVEs
30-day change
0.00 pp
From 9.18% 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< 4.9-1
- debian_linuxEOL9.0 | 10.0
Ubuntu2 products
- squid< 4.9-2ubuntu1
- squid3< 3.5.12-1ubuntu7.12 | < 3.5.27-1ubuntu1.7
Canonical1 product
- ubuntu_linuxEOL16.04 | 18.04 | 19.04 | 19.10
Fedoraproject1 product
- fedoraEOL30 | 31
Squid-cache1 product
- squid≥ 3.0, ≤ 3.5.28 | ≥ 4.0, ≤ 4.8
5 vendors · 7 products
References
15 links
- lists.debian.org/debian-lts-announce/2020/07/msg00009.htmlMailing ListX Refsource MLISTThird Party Advisory