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CVE-2015-3455

15
FAUCET Score

CVE-2015-3455 describes a vulnerability in Squid proxy versions 3.2.x, 3.3.x, 3.4.x, and 3.5.x when configured with client-first SSL-bump. The flaw lies in improper validation of X.509 certificate domain or hostname fields, enabling man-in-the-middle (MITM) attackers to spoof SSL servers using valid certificates. With a CVSS score indicating low impact (partial integrity loss) and high attack complexity, this vulnerability primarily affects the integrity of SSL connections. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
7CPE matchmatch criteria
cpe:2.3:o:oracle:linux:7:*:*:*:*:*:*:*
11.2CPE matchmatch criteria
cpe:2.3:o:oracle:solaris:11.2:*:*:*:*:*:*:*
3.2.0.1CPE matchmatch criteria
cpe:2.3:a:squid-cache:squid:3.2.0.1:*:*:*:*:*:*:*
3.2.0.2CPE matchmatch criteria
cpe:2.3:a:squid-cache:squid:3.2.0.2:*:*:*:*:*:*:*
3.2.0.3CPE matchmatch criteria
cpe:2.3:a:squid-cache:squid:3.2.0.3:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

2.6LOW

AV:N/AC:H/Au:N/C:N/I:P/A:N

Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
HIGH
Authentication
NONE
Exploitability Score
4.9
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
11.40%
Probability of exploitation in next 30 days
EPSS Percentile
95.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.1140 is in the 96th percentile among its peer group of 1,506 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.3 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (1)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: squid-7:3.3.8-26.el7
View patch

Vendor Advisories (1)

redhatCVE-2015-3455Moderate

squid: incorrect X509 server certificate validation (SQUID-2015:1)

May 1, 2015

References

advisories.mageia.org / MGASA-2015-0191.html
Third Party Advisory
lists.fedoraproject.org / pipermail/package-announce/2016-May/183598.html
Third Party Advisory
lists.opensuse.org / opensuse-updates/2015-09/msg00016.html
lists.opensuse.org / opensuse-updates/2016-08/msg00069.html
rhn.redhat.com / errata/RHSA-2015-2378.html
mandriva.com / security/advisories
Broken Link
oracle.com / technetwork/topics/security/bulletinjul2015-2511963.html
Third Party Advisory
oracle.com / technetwork/topics/security/linuxbulletinoct2015-2719645.html
Third Party Advisory
securityfocus.com / bid/74438
securitytracker.com / id/1032221
Third Party AdvisoryVDB Entry
squid-cache.org / Advisories/SQUID-2015_1.txt
Vendor Advisory