// For flags

CVE-2019-20454

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

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

1
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

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.

Se detectó una lectura fuera de límites en PCRE versiones anteriores a 10.34, cuando el patrón \X es compilado en JIT y usado para hacer coincidir temas especialmente diseñados en modo no UTF. Las aplicaciones que utilizan PCRE para analizar entradas no confiables pueden ser vulnerables a este fallo, lo que permitiría a un atacante bloquear la aplicación. El fallo ocurre en la función do_extuni_no_utf en el archivo pcre2_jit_compile.c.

An out-of-bounds read was discovered in PCRE when the pattern "\X" is JIT compiled and used to match specially crafted subjects in non-UTF mode. Applications that use PCRE to process untrusted input may be vulnerable to this flaw. An attacker could use this flaw to crash the application.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Local
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Local
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2020-02-14 CVE Reserved
  • 2020-02-14 CVE Published
  • 2024-06-09 EPSS Updated
  • 2024-08-05 CVE Updated
  • 2024-08-05 First Exploit
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-125: Out-of-bounds Read
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Pcre
Search vendor "Pcre"
 Pcre2
Search vendor "Pcre" for product "Pcre2"
 >= 10.31 < 10.34
Search vendor "Pcre" for product "Pcre2" and version " >= 10.31 < 10.34"
-
Affected
Fedoraproject
Search vendor "Fedoraproject"
 Fedora
Search vendor "Fedoraproject" for product "Fedora"
 31
Search vendor "Fedoraproject" for product "Fedora" and version "31"
-
Affected
Splunk
Search vendor "Splunk"
 Universal Forwarder
Search vendor "Splunk" for product "Universal Forwarder"
 >= 8.2.0 < 8.2.12
Search vendor "Splunk" for product "Universal Forwarder" and version " >= 8.2.0 < 8.2.12"
-
Affected
Splunk
Search vendor "Splunk"
 Universal Forwarder
Search vendor "Splunk" for product "Universal Forwarder"
 >= 9.0.0 < 9.0.6
Search vendor "Splunk" for product "Universal Forwarder" and version " >= 9.0.0 < 9.0.6"
-
Affected
Splunk
Search vendor "Splunk"
 Universal Forwarder
Search vendor "Splunk" for product "Universal Forwarder"
 9.1.0
Search vendor "Splunk" for product "Universal Forwarder" and version "9.1.0"
-
Affected