Home/CVE/libpcre in PCRE before 8.43 allows a subject buffer over-read in JIT when UTF is disabled, and \X or \R has more than on
CVE

CVE-2019-20838

libpcre in PCRE before 8.43 allows a subject buffer over-read in JIT when UTF is disabled, and \X or \R has more than on

libpcre in PCRE before 8.43 allows a subject buffer over-read in JIT when UTF is disabled, and \X or \R has more than one fixed quantifier, a related issue to CVE-2019-20454.

HIGH · CVSS 7.5 EPSS 0.00234
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules10 YARA rules0
⬡

Weakness Classification

CWE-125Out-of-bounds Read
▤

Affected Products & Versions

5
pcre< 8.43
apple macos< 11.0.1
splunk universal forwarder>= 8.2.0 and < 8.2.12
splunk universal forwarder>= 9.0.0 and < 9.0.6
splunk universal forwarderall versions
◈

Sigma Hunt Rules

10
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
producthighPCRE.NET Package Temp Files
producthighPCRE.NET Package Image Load
producthighSuspicious Microsoft Office Child Process - MacOS
producthighRemote Access Tool - Renamed MeshAgent Execution - MacOS
producthighBinary Padding - MacOS
productmediumSuspicious Execution via macOS Script Editor
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD15 Jun 2020 · 05:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
⚑

Vendor Advisories

9
usnUSN-5425-1
suse-csafSUSE-SU-2021:3652-1
suse-csafopenSUSE-SU-2021:1441-1
suse-csafopenSUSE-SU-2021:3529-1
suse-csafSUSE-SU-2021:3529-1
🔗

References & Sources

7
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://seclists.org/fulldisclosure/2020/Dec/32Mailing ListThird Party Advisory
http://seclists.org/fulldisclosure/2021/Feb/14Mailing ListThird Party Advisory
https://bugs.gentoo.org/717920Issue TrackingPatchThird Party AdvisoryVDB Entry
https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3EMailing ListThird Party Advisory
https://support.apple.com/kb/HT211931Vendor Advisory
https://support.apple.com/kb/HT212147Vendor Advisory
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