Cesanta Mongoose up to 7.20 DNS Transaction ID /src/dns.c mg_sendnsreq random random values

Summaryinfo

A vulnerability was found in Cesanta Mongoose up to 7.20. It has been rated as problematic. This affects the function mg_sendnsreq of the file /src/dns.c of the component DNS Transaction ID Handler. The manipulation of the argument random leads to random values. This vulnerability is listed as CVE-2026-2966. The attack may be initiated remotely. In addition, an exploit is available. The vendor was contacted early about this disclosure but did not respond in any way.

Detailsinfo

A vulnerability was found in Cesanta Mongoose up to 7.20 and classified as problematic. This issue affects the function mg_sendnsreq of the file /src/dns.c of the component DNS Transaction ID Handler. The manipulation of the argument Random with an unknown input leads to a random values vulnerability. Using CWE to declare the problem leads to CWE-330. The product uses insufficiently random numbers or values in a security context that depends on unpredictable numbers. Impacted is integrity.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-2966. The exploitation is known to be difficult. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details as well as a public exploit are known. MITRE ATT&CK project uses the attack technique T1600.001 for this issue.

The exploit is available at github.com. It is declared as proof-of-concept. The vendor was contacted early about this disclosure but did not respond in any way. The vulnerability scanner Nessus provides a plugin with the ID 299827 (Linux Distros Unpatched Vulnerability : CVE-2026-2966), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (299827). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 3.7
VulDB Meta Temp Score: 3.5

VulDB Base Score: 3.7
VulDB Temp Score: 3.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 3.7
CNA Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Random values
CWE: CWE-330 / CWE-310
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 299827
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-2966

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

02/22/2026 Advisory disclosed
02/22/2026 +0 days VulDB entry created
02/24/2026 +2 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Status: Not defined

CVE: CVE-2026-2966 (🔒)
GCVE (CVE): GCVE-0-2026-2966
GCVE (VulDB): GCVE-100-347333
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 02/22/2026 09:02
Updated: 02/24/2026 09:46
Changes: 02/22/2026 09:02 (58), 02/23/2026 07:16 (30), 02/24/2026 09:46 (2)
Complete: 🔍
Submitter: dwbruijn
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #755304: Cesanta Mongoose Embedded Web Server 7.20 Insufficiently Random Values (by dwbruijn)

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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