TI-2021-08914 Aliases CVE-2021-27425 GHSA-2vmf-rc4q-xhgw

Cesanta Software Mongoose-OS Integer Overflow or Wraparound

MEDIUM 51CWE-190Published 2022-05-03 · Updated 2025-04-16

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-190 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.01675 77th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Cesanta Software	Mongoose-OS	2.17.0	—	No fix listed	CNA

Mongoose-OS VendorCesanta Software Affected 2.17.0 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:o:cesanta:mongoose_os:2.17.0:::::::*	2.17.0	Vulnerable	Cesanta

cpe:2.3:o:cesanta:mongoose_os:2.17.0:*:*:*:*:*:*:* Versions 2.17.0 Vulnerable ·Cesanta

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-27425
2026-10-03 Alias added: GHSA-2vmf-rc4q-xhgw

References

Advisory 2

TI-2017-04881 Use-after-free vulnerability in the mg_http_multipart_wait_for_boundary function in… CVSS 3.0HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences