// For flags

CVE-2021-40647

 

Severity Score

5.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

1
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

In man2html 1.6g, a specific string being read in from a file will overwrite the size parameter in the top chunk of the heap. This at least causes the program to segmentation abort if the heap size parameter isn't aligned correctly. In version before GLIBC version 2.29 and aligned correctly, it allows arbitrary write anywhere in the programs memory.

En man2html versión 1.6g, una cadena específica que es leída desde un archivo sobrescribirá el parámetro de tamaño en el chunk superior del montón. Esto al menos causa que el programa aborte la segmentación si el parámetro de tamaño de la pila no está alineado correctamente. En versiones anteriores a 2.29 de GLIBC y alineado correctamente, permite una escritura arbitraria en cualquier parte de la memoria del programa

*Credits: N/A
CVSS Scores
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Local
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Complete
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-09-07 CVE Reserved
  • 2022-09-09 CVE Published
  • 2024-08-04 CVE Updated
  • 2024-08-04 First Exploit
  • 2025-07-06 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-787: Out-of-bounds Write
CAPEC
References (1)
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Man2html Project
Search vendor "Man2html Project"
Man2html
Search vendor "Man2html Project" for product "Man2html"
1.6g
Search vendor "Man2html Project" for product "Man2html" and version "1.6g"
-
Affected