CVE-2019-20454

HIGH EPSS 71.5%
Published Feb 14, 20206y ago · Modified Jun 17, 20262w ago
7.5 CVSS 3.1
High
Find Similar
Published Feb 14, 2020 6y ago
Last Modified Jun 17, 2026 2w ago

Description

An out-of-bounds read was discovered in PCRE before 10.34 when the pattern \X is JIT compiled and used to match specially crafted subjects in non-UTF mode. Applications that use PCRE to parse untrusted input may be vulnerable to this flaw, which would allow an attacker to crash the application. The flaw occurs in do_extuni_no_utf in pcre2_jit_compile.c.

CVSS Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
71.5% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-125 Out-of-bounds Read Memory Safety

Affected Products 5

VendorProductVersionRange
pcrepcre2*≥10.31  –  <10.34
fedoraprojectfedora31any
splunkuniversal_forwarder*≥8.2.0  –  <8.2.12
splunkuniversal_forwarder*≥9.0.0  –  <9.0.6
splunkuniversal_forwarder9.1.0any

References 7

  • bugs.exim.org https://bugs.exim.org/show_bug.cgi?id=2421
    Issue TrackingPermissions RequiredThird Party Advisory
  • bugs.php.net https://bugs.php.net/bug.php?id=78338
    ExploitIssue TrackingThird Party Advisory
  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=1735494
    Issue TrackingPatchThird Party Advisory
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2023/03/msg00014.html
    Mailing ListThird Party Advisory
  • lists.fedoraproject.org https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OQRAHYHLRNMBTPR3KXVM27NSZP3KTOPI/
    Mailing ListThird Party Advisory
  • security.gentoo.org https://security.gentoo.org/glsa/202006-16
    Third Party Advisory
  • vcs.pcre.org https://vcs.pcre.org/pcre2?view=revision&revision=1092
    Broken LinkPatch

Remediation

  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=1735494
    Issue TrackingPatchThird Party Advisory
  • vcs.pcre.org https://vcs.pcre.org/pcre2?view=revision&revision=1092
    Broken LinkPatch