What’s Vulnerable › Vulnerabilities

CVE-2021-27425: Cesanta Software Mongoose-OS Integer Overflow or Wraparound

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-05-03 · updated 2026-06-17
• Weakness: CWE-190

Description

Cesanta Software Mongoose-OS v2.17.0 is vulnerable to integer wrap-around in function mm_malloc. This improper memory assignment can lead to arbitrary memory allocation, resulting in unexpected behavior such as a crash or a remote code injection/execution.

Affected products

• Cesanta Software Mongoose-OS: 2.17.0

References

• https://github.com/cesanta/mongoose-os
• https://www.cisa.gov/uscert/ics/advisories/icsa-21-119-04
• https://github.com/cesanta/mongoose-os
• https://www.cisa.gov/uscert/ics/advisories/icsa-21-119-04

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