High severity · published Feb 14, 2020
CVE-2019-20454
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
7.5
CVSS
1.6%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.6% · higher than 75% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FE
Fedora · Fedoraproject
31 · source: NVD
PC
Pcre2 · Pcre
10.31 before 10.34 · source: NVD
UF
Universal Forwarder · Splunk
8.2.0 before 8.2.12; 9.0.0 before 9.0.6; 9.1.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-20454
CVE.org
https://www.cve.org/CVERecord?id=CVE-2019-20454
Issue Tracking
https://bugs.exim.org/show_bug.cgi?id=2421
Exploit
https://bugs.php.net/bug.php?id=78338
Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=1735494
Mailing List
https://lists.debian.org/debian-lts-announce/2023/03/msg00014.html
Mailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OQRAHYHLRNMBTPR3KXVM27NSZP3KTOPI/
Third Party Advisory
https://security.gentoo.org/glsa/202006-16
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