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CVE-2023-50269

50
FAUCET Score

CVE-2023-50269 is an uncontrolled recursion vulnerability affecting Squid caching proxy versions 2.6 through 2.7.STABLE9, 3.1 through 5.9, and 6.0.1 through 6.5. A remote attacker can exploit this flaw by sending a large X-Forwarded-For header when the 'follow_x_forwarded_for' feature is configured, leading to a Denial of Service (DoS) attack against HTTP Request parsing. This vulnerability has a CVSS score of 7.5 (HIGH), indicating a network-based attack with low complexity and high impact on availability. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 3.1, <= 5.9CPE matchmatch criteria
cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:*
>= 6.0.1, <= 6.5CPE matchmatch criteria
cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:*
2.6CPE matchmatch criteria
cpe:2.3:a:squid-cache:squid:2.6:*:*:*:*:*:*:*
2.7CPE matchmatch criteria
cpe:2.3:a:squid-cache:squid:2.7:-:*:*:*:*:*:*
2.7CPE matchmatch criteria
cpe:2.3:a:squid-cache:squid:2.7:stable1:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.6HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
4.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
57.63%
Probability of exploitation in next 30 days
EPSS Percentile
99.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.5763 is in the 98th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (13)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: squid-7:3.5.20-17.el7_9.10
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: squid:4-8090020240314114525.a75119d5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.2 Advanced Update SupportFixed in: squid:4-8020020240122164331.4cda2c84
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.2 Telecommunications Update ServiceFixed in: squid:4-8020020240122164331.4cda2c84
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.2 Update Services for SAP SolutionsFixed in: squid:4-8020020240122164331.4cda2c84
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportFixed in: squid:4-8040020240122165847.522a0ee4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.4 Telecommunications Update ServiceFixed in: squid:4-8040020240122165847.522a0ee4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.4 Update Services for SAP SolutionsFixed in: squid:4-8040020240122165847.522a0ee4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.6 Extended Update SupportFixed in: squid:4-8060020231222131040.ad008a3a
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.8 Extended Update SupportFixed in: squid:4-8080020231222130009.63b34585
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: squid-7:5.5-6.el9_3.8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9.0 Extended Update SupportFixed in: squid-7:5.2-1.el9_0.4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9.2 Extended Update SupportFixed in: squid-7:5.5-5.el9_2.4
View patch

Vendor Advisories (1)

redhatCVE-2023-50269Important

squid: denial of service in HTTP request parsing

Dec 14, 2023

References

github.com / squid-cache/squid/security/advisories/GHSA-wgq4-4cfg-c4x3
Third Party Advisory
lists.debian.org / debian-lts-announce/2024/01/msg00003.html
lists.fedoraproject.org / archives/list/[email protected]/message/A5QASTMCUSUEW3UOMKHZJB3FTONWSRXS
lists.fedoraproject.org / archives/list/[email protected]/message/MEV66D3PAAY6K7TWDT3WZBLCPLASFJDC
security.netapp.com / advisory/ntap-20240119-0005
squid-cache.org / Versions/v5/SQUID-2023_10.patch
Broken Link
squid-cache.org / Versions/v6/SQUID-2023_10.patch
Broken Link