CVE-2021-40346: debian debian_linux Integer Overflow or Wraparound

Vulnerability summary

CVE-2021-40346 is a high (CVSS 7.5) Integer Overflow or Wraparound vulnerability in debian debian_linux. EPSS estimates a 58.83% chance of exploitation in the next 30 days, higher than 99.1% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 08-09-2021
   PublishedVulnerability first disclosed.
2. 04-08-2024
   Last modifiedVulnerability information updated.

Description

An integer overflow exists in HAProxy 2.0 through 2.5 in htx_add_header that can be exploited to perform an HTTP request smuggling attack, allowing an attacker to bypass all configured http-request HAProxy ACLs and possibly other ACLs.

• CWE-190Integer Overflow or WraparoundThe product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.