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CVE-2015-8852

20
FAUCET Score

CVE-2015-8852 describes an HTTP response splitting vulnerability in Varnish 3.x before version 3.0.7, specifically when used in certain stacked configurations. Attackers can inject arbitrary HTTP headers by sending a carriage return character within a header line alongside multiple Content-Length headers. This vulnerability has a CVSS score of 7.5 (High), indicating a network-based attack with low complexity and high impact on integrity, but no impact on confidentiality or availability. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
3.0.0CPE matchmatch criteria
cpe:2.3:a:varnish_cache_project:varnish_cache:3.0.0:beta1:*:*:*:*:*:*
3.0.0CPE matchmatch criteria
cpe:2.3:a:varnish_cache_project:varnish_cache:3.0.0:beta2:*:*:*:*:*:*
3.0.1CPE matchmatch criteria
cpe:2.3:a:varnish_cache_project:varnish_cache:3.0.1:*:*:*:*:*:*:*
3.0.2CPE matchmatch criteria
cpe:2.3:a:varnish_cache_project:varnish_cache:3.0.2:*:*:*:*:*:*:*
3.0.3CPE matchmatch criteria
cpe:2.3:a:varnish_cache_project:varnish_cache:3.0.3:*:*:*:*:*:*:*

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:H/A:N

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

Exploit Intelligence

EPSS Score
3.52%
Probability of exploitation in next 30 days
EPSS Percentile
88.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0352 is in the 79th percentile among its peer group of 51,553 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, 0.1 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

Vendor Advisories (1)

redhatCVE-2015-8852Important

varnish: http smuggling issues

Mar 12, 2015

References

lists.opensuse.org / opensuse-updates/2016-05/msg00064.html
github.com / varnish/Varnish-Cache/commit/29870c8fe95e4e8a672f6f28c5fbe692bea09e9c
github.com / varnish/Varnish-Cache/commit/85e8468bec9416bd7e16b0d80cb820ecd2b330c3
security.gentoo.org / glsa/201607-10
varnish-cache.org / lists/pipermail/varnish-announce/2015-March/000701.html
Vendor Advisory
debian.org / security/2016/dsa-3553
openwall.com / lists/oss-security/2016/04/16/1
openwall.com / lists/oss-security/2016/04/18/7