Out-of-bounds Read in Pcre Pcre2
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. 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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.016 (75.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 75.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000
Affected products
- Pcre Pcre2
- Splunk Universal Forwarder — versions 9.1.0
- Fedoraproject Fedora — versions 31
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugs.exim.org/show_bug.cgi (Permissions Required, Third Party Advisory, Issue Tracking)
- bugs.php.net/bug.php (Exploit, Third Party Advisory, Issue Tracking)
- vcs.pcre.org/pcre2 (Patch, Broken Link)
- bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
- security.gentoo.org/glsa/202006-16 (vendor-advisory, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory, Mailing List, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2023/03/msg00014.html (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2019-20454?
- CVE-2019-20454 is a high-severity vulnerability in Pcre Pcre2, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2020-02-14.
- How severe is CVE-2019-20454?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2019-20454 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.