Is CVE-2015-8852 in the CISA KEV catalog?

No. CVE-2015-8852 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-8852?

CVE-2015-8852 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2015-8852?

CVE-2015-8852 has an EPSS score of 3.52% (88th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-8852?

Upgrade varnish on debian 11 to 4.0.0-1 or later.

CVE & CISA-KEV Catalog

CVE-2015-8852

HIGHEPSS 88th pctl

7.5

CVSS v3

NVD

Description

Varnish 3.x before 3.0.7, when used in certain stacked installations, allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via a header line terminated by a \r (carriage return) character in conjunction with multiple Content-Length headers in an HTTP request.

How to fix

Remediation Available

varnishDebian

Fixed in:4.0.0-1CVE-2015-8852

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

3.52%probability of exploitation in 30 days

88thpercentile

Elevated risk: more likely to be exploited than 88% of all known CVEs.

References

Vendor Advisory1

varnish-cache.org

Other references7

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.