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No exploitation reportedFix available

CVE-2019-20454

No exploitation reported by the sources we read.

  • Published2020-02-14
  • Fixed in9.0.6 · 8.2.12
  • WeaknessCWE-125

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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

dates in UTC
  1. 2020-02-14CVE publishedCNA

Versions per branch

NVD
Splunk universal forwarder
BranchAffectedFixed in
9.0≥ 9.0.0, < 9.0.69.0.6
8.2≥ 8.2.0, < 8.2.128.2.12
9.1= 9.1.0no fix published
Fedoraproject fedora
BranchAffectedFixed in
31.x= 31no fix published
Pcre pcre2
BranchAffectedFixed in
10.x≥ 10.31, < 10.3410.34

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • libzipRocky Linux:8all versions · fixed in 0:1.5.2-1.module+el8.4.0+414+2e7afcdd
  • libzipRed Hat:enterprise_linux:8::appstreamall versions · fixed in 0:1.5.2-1.module+el8.1.0+3189+a1bff096and 5 other packages
  • libzipAlmaLinux:8all versions · fixed in 1.5.2-1.module_el8.3.0+2009+b272fdefand 2 other packages
  • libzipAlmaLinux:8all versions · fixed in 1.5.2-1.module_el8.4.0+2229+b272fdefand 2 other packages
  • libzipAlmaLinux:8all versions · fixed in 1.5.2-1.module_el8.5.0+152+112d3b8cand 2 other packages
  • pcre2Ubuntu:Pro:18.04:LTSall versions · no fixed version listed
  • pcre2SUSE:Manager Server 4.1all versions · fixed in 10.31-150000.3.12.1
  • pcre2SUSE:Manager Retail Branch Server 4.1all versions · fixed in 10.31-150000.3.12.1

59 more package ranges on OSV.dev

Vendor advisories

  • CVE-2019-20454 Red Hat Product Security371 products fixed · 21 known affected

    pcre: Out of bounds read in JIT mode when \X is used in non-UTF mode

    pcre.src as a component of Red Hat Enterprise Linux 5 · chromium-browser as a component of Red Hat Enterprise Linux 6 · chromium-browser.src as a component of Red Hat Enterprise Linux 6 · +18 more

  • RHSA-2020:4539 Red Hat Product Security70 products fixed

    Red Hat Security Advisory: pcre2 security and enhancement update

  • RHSA-2020:3662 Red Hat Product Security301 products fixed

    Red Hat Security Advisory: php:7.3 security, bug fix, and enhancement update

Full record on NVD

Fix

  1. Update Splunk universal forwarder to 9.0.6 · 8.2.12
  2. Vendor fix Red Hat Product Security RHSA-2020:4539 · 70 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
  3. Vendor fix Red Hat Product Security RHSA-2020:3662 · 301 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing the updated packages, the httpd daemon must be restarted for the update to take effect.
  4. No fix planned, says the vendor Red Hat Product Security CVE-2019-20454 · 21 productsOut of support scope

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2020-02-14
Last Modified
2026-11-02
NVD status
Modified
GitHub Advisory
GHSA-6wcm-vmc4-h93p

Frequently asked questions

What is 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.

Is CVE-2019-20454 actively exploited?

Active exploitation of CVE-2019-20454 has not been confirmed. Its EPSS score was 1.6% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-20454?

CVE-2019-20454 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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