Is CVE-2017-8399 in the CISA KEV catalog?

No. CVE-2017-8399 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-8399?

CVE-2017-8399 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2017-8399?

CVE-2017-8399 has an EPSS score of 3.12% (86th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-8399?

Upgrade pcre2 to 10.30 or later.

CVE & CISA-KEV Catalog

CVE-2017-8399

CRITICALEPSS 86th pctl

9.8

CVSS v3

NVD

Description

PCRE2 before 10.30 has an out-of-bounds write caused by a stack-based buffer overflow in pcre2_match.c, related to a "pattern with very many captures."

CWE-119Buffer Overflow

How to fix

Remediation Available

pcre2NVD

Affected:< 10.30Fixed in:10.30CVE-2017-8399derived from NVD

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

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

3.12%probability of exploitation in 30 days

86thpercentile

Elevated risk: more likely to be exploited than 86% of all known CVEs.

References

Patch1

vcs.pcre.org

Third-Party Advisory3

Other references1

vcs.pcre.org

Related Vulnerabilities

Other CWE-119 (Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-4966	Critical	9.4	100%	KEV + Ransom	Fix
CVE-2017-11882	High	7.8	100%	KEV + Ransom	-
CVE-2020-0796	Critical	10.0	100%	KEV + Ransom	-
CVE-2008-4250	Critical	9.8	99%	KEV	-
CVE-2017-15944	Critical	9.8	98%	KEV	Fix
CVE-2015-0014	High	10.0	97%	-	-

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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 2026-05-13.