Is CVE-2015-8391 being actively exploited?

CVE-2015-8391 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2015-8391?

CVE-2015-8391 has a CVSS 3.1 base score of 9.8 (CRITICAL).

CVE-2015-8391

CRITICAL · CVSS 9.8EPSS 6.4%EU EUVD

The pcre_compile function in pcre_compile.c in PCRE before 8.38 mishandles certain [: nesting, which allows remote attackers to cause a denial of service (CPU consumption) or possibly have unspecified other impact via a crafted regular expression, as demonstrated by a JavaScript RegExp object encountered by Konqueror.

Key facts

CVSS score: 9.8 (v3.1)
Severity: CRITICAL
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-119
EPSS score: 6.4% (94th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2015-8273)
Published: December 2, 2015
NVD last modified: June 17, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2015-8273 in the EU Vulnerability Database. Last updated in EUVD on August 6, 2024.

View on the EU Vulnerability Database

Affected products

fedoraproject / fedora
oracle / linux
pcre / pcre
php / php
redhat / enterprise linux desktop
redhat / enterprise linux eus
redhat / enterprise linux eus
redhat / enterprise linux eus
redhat / enterprise linux eus
redhat / enterprise linux eus
redhat / enterprise linux eus
redhat / enterprise linux server
redhat / enterprise linux server aus
redhat / enterprise linux server aus
redhat / enterprise linux server aus
redhat / enterprise linux server aus
redhat / enterprise linux server aus
redhat / enterprise linux server tus
redhat / enterprise linux server tus
redhat / enterprise linux server tus
redhat / enterprise linux server tus
redhat / enterprise linux workstation

Certified products that may be affected

21 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Oracle Linux 7 NSS Cryptographic Module - Oracle Corporation - FIPS 140 4586 - historical
Oracle Linux 7 Libreswan Cryptographic Module - Oracle Corporation - FIPS 140 4266 - historical
Oracle Linux 7 OpenSSH Client Cryptographic Module - Oracle Corporation - FIPS 140 4206 - historical
Oracle Linux 7 OpenSSH Server Cryptographic Module - Oracle Corporation - FIPS 140 4176 - historical
Oracle Linux 7 Unbreakable Enterprise Kernel (UEK 6) Cryptographic Module - Oracle Corporation - FIPS 140 4169 - historical

See all 21 in the Security Certifications Explorer.

References

http://lists.fedoraproject.org/pipermail/package-announce/2016-January/174931.html(Mailing List, Third Party Advisory)
http://rhn.redhat.com/errata/RHSA-2016-1025.html(Third Party Advisory)
http://rhn.redhat.com/errata/RHSA-2016-2750.html(Third Party Advisory)
http://vcs.pcre.org/pcre/code/trunk/ChangeLog?view=markup(Broken Link)
http://www-01.ibm.com/support/docview.wss?uid=isg3T1023886(Third Party Advisory)
http://www.openwall.com/lists/oss-security/2015/11/29/1(Mailing List, Third Party Advisory)
http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html(Third Party Advisory)
http://www.securityfocus.com/bid/82990(Third Party Advisory, VDB Entry)
https://access.redhat.com/errata/RHSA-2016:1132(Third Party Advisory)
https://bto.bluecoat.com/security-advisory/sa128(Permissions Required)
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05240731(Third Party Advisory)
https://security.gentoo.org/glsa/201607-02(Third Party Advisory)
https://security.netapp.com/advisory/ntap-20230216-0002/

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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