Predictive Vulnerability Intelligence.

Product

  • Product
  • Pricing
  • Documentation

Company

  • About
  • Partnerships
  • Blog
  • Support

Legal

  • Terms
  • Privacy
  • Data Licensing

© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2016-2569

41
FAUCET Score

CVE-2016-2569 describes a denial-of-service vulnerability in Squid versions 3.x before 3.5.15 and 4.x before 4.0.7. Remote servers can exploit a flaw in how Squid appends data to String objects, specifically via a crafted HTTP Vary header, leading to an assertion failure and daemon exit. This vulnerability carries a high CVSS score of 7.5, indicating a network-based attack with low complexity and high impact on availability. There is no evidence of active exploitation, nor is public exploit code available, and it has received minimal community and media attention.

Impacted Technologies

VendorProductVersion(s)CPE
3.0CPE matchmatch criteria
cpe:2.3:a:squid-cache:squid:3.0:*:*:*:*:*:*:*
3.0CPE matchmatch criteria
cpe:2.3:a:squid-cache:squid:3.0:-:pre1:*:*:*:*:*
3.0CPE matchmatch criteria
cpe:2.3:a:squid-cache:squid:3.0:-:pre2:*:*:*:*:*
3.0CPE matchmatch criteria
cpe:2.3:a:squid-cache:squid:3.0:-:pre3:*:*:*:*:*
3.0CPE matchmatch criteria
cpe:2.3:a:squid-cache:squid:3.0:-:pre4:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
31.19%
Probability of exploitation in next 30 days
EPSS Percentile
98.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.3119 is in the 97th percentile among its peer group of 51,485 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 (4)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: squid-7:3.5.20-2.el7
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: squid
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: squid
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: squid34

Vendor Advisories (1)

redhatCVE-2016-2569Moderate

squid: some code paths fail to check bounds in string object

Feb 24, 2016

References

lists.opensuse.org / opensuse-security-announce/2016-08/msg00010.html
lists.opensuse.org / opensuse-security-announce/2016-08/msg00040.html
lists.opensuse.org / opensuse-updates/2016-08/msg00069.html
rhn.redhat.com / errata/RHSA-2016-2600.html
security.gentoo.org / glsa/201607-01
usn.ubuntu.com / 3557-1
openwall.com / lists/oss-security/2016/02/26/2
securitytracker.com / id/1035101
squid-cache.org / Advisories/SQUID-2016_2.txt
Vendor Advisory
squid-cache.org / Versions/v3/3.5/changesets/squid-3.5-13991.patch
squid-cache.org / Versions/v4/changesets/squid-4-14552.patch