CVE-2026-6986

LOW EPSS 12.1%
Published Apr 25, 20262mo ago · Modified Jun 17, 20262w ago
2.9 CVSS 4.0
Low
Find Similar
Published Apr 25, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago

Description

A security vulnerability has been detected in Cesanta Mongoose up to 7.20. This issue affects the function mg_aes_gcm_decrypt of the file /src/tls_aes128.c of the component GCM Authentication Tag Handler. Such manipulation leads to improper verification of cryptographic signature. The attack may be performed from remote. A high complexity level is associated with this attack. The exploitability is assessed as difficult. The exploit has been disclosed publicly and may be used. Upgrading to version 7.21 is capable of addressing this issue. It is advisable to upgrade the affected component. VulDB has contacted the vendor early and they confirmed quickly, that this issue got fixed already.

CVSS Details

Base Score
2.9
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
12.1% percentile
Exploit & Patch Status
Public Exploit Known
No Patch Available

Weaknesses 2

CWE-345
CWE-347

Affected Products 1

VendorProductVersionRange
cesantamongoose*≥7.0  –  <7.21

References 5

  • github.com https://github.com/cesanta/mongoose/releases/tag/7.21
    Release Notes
  • github.com https://github.com/dwBruijn/CVEs/blob/main/Mongoose/AESGCM.md
    ExploitThird Party Advisory
  • vuldb.com https://vuldb.com/submit/796231
    Third Party AdvisoryVDB Entry
  • vuldb.com https://vuldb.com/vuln/359529
    Third Party AdvisoryVDB Entry
  • vuldb.com https://vuldb.com/vuln/359529/cti
    Permissions RequiredVDB Entry

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.