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CVE-2026-6985
5.3 MEDIUM
- CVSS version (CVSS): 3.1
- Attack Vector (AV): Network (N)
- Attack Complexity (AC): Low (L)
- Privileges Required (PR): None (N)
- User Interaction (UI): None (N)
- Scope (S): Unchanged (U)
- Confidentiality (C): None (N)
- Integrity (I): None (N)
- Availability (A): Low (L)
- Exploit Code Maturity (E): Proof-of-Concept (P)
- Remediation Level (RL): Official Fix (O)
- Report Confidence (RC): Confirmed (C)
- Modified Attack Vector (MAV): Network (N)
- Modified Attack Complexity (MAC): Low (L)
- Modified Privileges Required (MPR): None (N)
- Modified User Interaction (MUI): None (N)
- Modified Confidentiality (MC): None (N)
- Modified Scope (MS): Unchanged (U)
- Modified Integrity (MI): None (N)
- Modified Availability (MA): Low (L)
Activity log
- Created suggestion
Cesanta Mongoose TCP Option net_builtin.c handle_opt infinite loop
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.
References
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VDB-359528 | Cesanta Mongoose TCP Option net_builtin.c handle_opt infinite loop vdb-entrytechnical-description
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Submit #796230 | Cesanta Mongoose 7.20 Denial of Service third-party-advisory
Affected products
Mongoose
- ==7.20
- ==7.21
- ==7.11
- ==7.17
- ==7.0
- ==7.16
- ==7.4
- ==7.2
- ==7.18
- ==7.3
- ==7.12
- ==7.1
- ==7.15
- ==7.8
- ==7.5
- ==7.14
- ==7.13
- ==7.19
- ==7.10
- ==7.9
- ==7.7
- ==7.6
Package maintainers
-
@wegank Weijia Wang <contact@weijia.wang>