CVE-2026-6985

MEDIUM EPSS 42.6%
Published Apr 25, 20262mo ago · Modified Jun 17, 20262w ago
5.5 CVSS 4.0
Medium
Find Similar
Published Apr 25, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago

Description

A weakness has been identified in Cesanta Mongoose up to 7.20. This vulnerability affects the function handle_opt of the file /src/net_builtin.c of the component TCP Option Handler. This manipulation of the argument optlen causes infinite loop. The attack is possible to be carried out remotely. The exploit has been made available to the public and could be used for attacks. Upgrading to version 7.21 is able to resolve this issue. Upgrading the affected component is advised. VulDB has contacted the vendor early and they confirmed quickly, that this issue got fixed already.

CVSS Details

Base Score
5.5
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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 Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
42.6% percentile
Exploit & Patch Status
Public Exploit Known
No Patch Available

Weaknesses 2

CWE-404
CWE-835

Affected Products 1

VendorProductVersionRange
cesantamongoose*≥7.0  –  <7.21

References 5

  • github.com https://github.com/cesanta/mongoose/releases/tag/7.21
    ProductRelease Notes
  • github.com https://github.com/dwBruijn/CVEs/blob/main/Mongoose/TCP_opt_dos.md
    ExploitThird Party Advisory
  • vuldb.com https://vuldb.com/submit/796230
    Third Party AdvisoryVDB Entry
  • vuldb.com https://vuldb.com/vuln/359528
    Third Party AdvisoryVDB Entry
  • vuldb.com https://vuldb.com/vuln/359528/cti
    Permissions RequiredVDB Entry

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.