CVE-2020-8450

An issue was discovered in Squid before 4.10. Due to incorrect buffer management, a remote client can cause a buffer overflow in a Squid instance acting as a reverse proxy.

Published: 2020-02-04 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-8450 is rated High Risk (68.4/100): CVSS High severity, with high exploitation likelihood (EPSS 46.29%, 98th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +16.13% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2020-8450

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-03-04 30.15% 46.29% +16.13%
2 2026-03-01 46.29% 30.15% -16.13%
3 2026-02-04 — 46.29% —

Full EPSS history (56 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-8450

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.3 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 3.9 3.4 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2020-8450

OS Trackers for CVE-2020-8450

vendor priority summary link
alpine high CVE-2020-8450: 1 source package rows (squid); 25 state rows across 10 repos (3.10-main, 3.11-main, 3.12-main, 3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 10, open 15. https://security.alpinelinux.org/vuln/CVE-2020-8450
debian not yet assigned CVE-2020-8450 not yet assigned priority: Debian including 1 source packages (squid), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2020-8450
gentoo normal CVE-2020-8450: 1 GLSA(s) (202003-34), 1 atom(s) (net-proxy/squid); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2020-8450
redhat medium — https://access.redhat.com/security/cve/CVE-2020-8450
suse high CVE-2020-8450 severity important: SUSE including 14 source package names (libecap-1.0.1-2.module+el8.1.0+4044+36416a77, libecap-devel-1.0.1-2.module+el8.1.0+4044+36416a77, …), 39 product×package rows across 35 product lines (HPE Helion OpenStack 8, Image SLES15-SP3-Manager-4-2-Proxy-BYOS-Azure, … (35 product lines)): Fixed 39. https://www.suse.com/security/cve/CVE-2020-8450/
ubuntu medium CVE-2020-8450 medium priority: Ubuntu including 2 source packages (squid, squid3), 16 status rows across 8 suites (bionic, eoan, focal, groovy, hirsute, trusty, upstream, xenial): DNE 8, released 6, needs-triage 2. https://ubuntu.com/security/CVE-2020-8450

Affected software / configurations for CVE-2020-8450

Vendor Product Version Raw CPE
squid-cache squid < 4.10 cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:*
canonical ubuntu_linux 16.04 cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 18.04 cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 19.10 cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*
opensuse leap 15.1 cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
fedoraproject fedora 30 cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
fedoraproject fedora 31 cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

References for CVE-2020-8450

URL Tags
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00012.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00010.html Mailing List Third Party Advisory
http://www.squid-cache.org/Advisories/SQUID-2020_1.txt Vendor Advisory
http://www.squid-cache.org/Versions/v3/3.5/changesets/SQUID-2020_1.patch Patch Vendor Advisory
http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-8e657e835965c3a011375feaa0359921c5b3e2dd.patch Patch Vendor Advisory
http://www.squid-cache.org/Versions/v4/changesets/SQUID-2020_1.patch Patch Vendor Advisory
http://www.squid-cache.org/Versions/v4/changesets/squid-4-b3a0719affab099c684f1cd62b79ab02816fa962.patch Patch Vendor Advisory
http://www.squid-cache.org/Versions/v4/changesets/squid-4-d8e4715992d0e530871519549add5519cbac0598.patch Patch Vendor Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G6W2IQ7QV2OGREFFUBNVZIDD3RJBDE4R/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TSU6SPANL27AGK5PCGBJOKG4LUWA555J/
https://security.gentoo.org/glsa/202003-34 Third Party Advisory
https://security.netapp.com/advisory/ntap-20210304-0002/ Third Party Advisory
https://usn.ubuntu.com/4289-1/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4682 Third Party Advisory
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