CVE-2021-3657: debian debian_linux

Vulnerability summary

CVE-2021-3657 is a critical (CVSS 9.8) vulnerability in debian debian_linux. EPSS estimates a 3.49% chance of exploitation in the next 30 days, higher than 88.9% of scored vulnerabilities.

Timeline

1. 18-02-2022
   PublishedVulnerability first disclosed.
2. 03-08-2024
   Last modifiedVulnerability information updated.

Description

A flaw was found in mbsync versions prior to 1.4.4. Due to inadequate handling of extremely large (>=2GiB) IMAP literals, malicious or compromised IMAP servers, and hypothetically even external email senders, could cause several different buffer overflows, which could conceivably be exploited for remote code execution.

• CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferThe product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.