CVE-2015-8387

PCRE before 8.38 mishandles (?123) subroutine calls and related subroutine calls, which allows remote attackers to cause a denial of service (integer overflow) or possibly have unspecified other impact via a crafted regular expression, as demonstrated by a JavaScript RegExp object encountered by Konqueror.

Published: 2015-12-02 Last update: 2026-05-06 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2015-8387 is rated Moderate Risk (62.2/100): CVSS High severity, with medium exploitation likelihood (EPSS 3.64%). EPSS rose +2.19% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2015-8387

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.45% 3.64% +2.19%
2 2026-03-23 1.94% 1.45% -0.49%
3 2026-03-10 — 1.94% —

Full EPSS history (20 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2015-8387

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.3 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 3.9 3.4 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2015-8387

OS Trackers for CVE-2015-8387

vendor priority summary link
debian not yet assigned CVE-2015-8387 not yet assigned priority: Debian including 1 source packages (pcre3), 2 status rows across 2 suites (bookworm, bullseye): resolved 2. https://security-tracker.debian.org/tracker/CVE-2015-8387
gentoo normal CVE-2015-8387: 1 GLSA(s) (201607-02), 1 atom(s) (dev-libs/libpcre); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2015-8387
redhat — — https://access.redhat.com/security/cve/CVE-2015-8387
suse critical CVE-2015-8387 severity critical: SUSE including 35 source package names (0.9.1:libpcre1-8.39-7.1, 1.0.0:libpcre1-8.39-7.1, …), 156 product×package rows across 69 product lines (Container caasp/v4/default-http-backend, Container caasp/v4/dnsmasq-nanny, … (69 product lines)): Fixed 105, Known Not Affected 51. https://www.suse.com/security/cve/CVE-2015-8387/
ubuntu low CVE-2015-8387 low priority: Ubuntu including 2 source packages (pcre2, pcre3), 16 status rows across 8 suites (precise, trusty, upstream, vivid, wily, xenial, yakkety, zesty): not-affected 7, DNE 4, released 4, ignored 1. https://ubuntu.com/security/CVE-2015-8387

Affected software / configurations for CVE-2015-8387

Vendor Product Version Raw CPE
pcre perl_compatible_regular_expression_library <= 8.37 cpe:2.3:a:pcre:perl_compatible_regular_expression_library:*:*:*:*:*:*:*:*
fedoraproject fedora 22 cpe:2.3:o:fedoraproject:fedora:22:*:*:*:*:*:*:*
php php >= 5.5.0, < 5.5.32 cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
php php >= 5.6.0, < 5.6.18 cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
php php >= 7.0.0, < 7.0.3 cpe:2.3:a:php:php:*:*:*:*:*:*:*:*

References for CVE-2015-8387

cvelogic Threat Intelligence