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CVE-2019-20454An 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…
- 5.1MediumCVSS base score
- 1.6%Exploitation in 30 daysEPSS · top 24% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
Published
- 7 years later
· 7 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| mitreCNA (assigner) | 3.0 | Medium5.1 | CVSS:3.0/AC:H/AV:L/A:H/C:N/I:N/PR:N/S:U/UI:N |
| NVDNVD · Modified | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 1.6% · top 24% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.1.
Affected products
n/a
- affected n/a
References
References7
- https://bugs.exim.org/show_bug.cgi?id=2421 (opens in a new tab)x_transferred
- https://bugs.php.net/bug.php?id=78338 (opens in a new tab)x_transferred
- https://vcs.pcre.org/pcre2?view=revision&revision=1092 (opens in a new tab)x_transferred
- https://bugzilla.redhat.com/show_bug.cgi?id=1735494 (opens in a new tab)x_transferred
- GLSA-202006-16 (opens in a new tab)vendor-advisoryx_transferred
- FEDORA-2020-b11cf352bd (opens in a new tab)vendor-advisoryx_transferred
- [debian-lts-announce] 20230316 [SECURITY] [DLA 3363-1] pcre2 security update (opens in a new tab)mailing-listx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2019-11000 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2019-20454)Record last updated .