Cesanta Mongoose DNS Transaction ID dns.c mg_sendnsreq random values

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-2966
StatePUBLISHED
AssignerVulDB
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-02-23 03:15:59 UTC
Updated2026-04-29 01:00:01 UTC
DescriptionA weakness has been identified in Cesanta Mongoose up to 7.20. The impacted element is the function mg_sendnsreq of the file /src/dns.c of the component DNS Transaction ID Handler. Executing a manipulation of the argument random can lead to insufficiently random values. The attack can be launched remotely. The attack requires a high level of complexity. The exploitability is regarded as difficult. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

Risk And Classification

Primary CVSS: v4.0 2.9 LOW from [email protected]

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

Problem Types: CWE-310 | CWE-330 | CWE-330 Insufficiently Random Values | CWE-310 Cryptographic Issues

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary2.9LOWCVSS: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/C...
4.0CNADECLARED6.3MEDIUMCVSS: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
3.1[email protected]Primary3.7LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
3.1CNADECLARED3.7LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R
3.0CNADECLARED3.7LOWCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R
2.0[email protected]Secondary2.6AV:N/AC:H/Au:N/C:N/I:P/A:N
2.0CNADECLARED2.6AV:N/AC:H/Au:N/C:N/I:P/A:N/E:POC/RL:ND/RC:UR

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
High
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Cesanta Mongoose All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Cesanta Mongoose affected 7.0 Not specified
CNA Cesanta Mongoose affected 7.1 Not specified
CNA Cesanta Mongoose affected 7.2 Not specified
CNA Cesanta Mongoose affected 7.3 Not specified
CNA Cesanta Mongoose affected 7.4 Not specified
CNA Cesanta Mongoose affected 7.5 Not specified
CNA Cesanta Mongoose affected 7.6 Not specified
CNA Cesanta Mongoose affected 7.7 Not specified
CNA Cesanta Mongoose affected 7.8 Not specified
CNA Cesanta Mongoose affected 7.9 Not specified
CNA Cesanta Mongoose affected 7.10 Not specified
CNA Cesanta Mongoose affected 7.11 Not specified
CNA Cesanta Mongoose affected 7.12 Not specified
CNA Cesanta Mongoose affected 7.13 Not specified
CNA Cesanta Mongoose affected 7.14 Not specified
CNA Cesanta Mongoose affected 7.15 Not specified
CNA Cesanta Mongoose affected 7.16 Not specified
CNA Cesanta Mongoose affected 7.17 Not specified
CNA Cesanta Mongoose affected 7.18 Not specified
CNA Cesanta Mongoose affected 7.19 Not specified
CNA Cesanta Mongoose affected 7.20 Not specified

References

ReferenceSourceLinkTags
vuldb.com [email protected] vuldb.com Permissions Required, VDB Entry
github.com/dwBruijn/CVEs/blob/main/Mongoose/mg_sendnsreq.md [email protected] github.com Exploit, Third Party Advisory
vuldb.com [email protected] vuldb.com Third Party Advisory, VDB Entry
github.com/dwBruijn/CVEs/blob/main/Mongoose/mg_sendnsreq.md [email protected] github.com Exploit, Third Party Advisory
vuldb.com [email protected] vuldb.com Third Party Advisory, VDB Entry
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: dwbruijn (VulDB User) (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-02-22T00:00:00.000ZAdvisory disclosed
CNA2026-02-22T01:00:00.000ZVulDB entry created
CNA2026-02-22T09:02:36.000ZVulDB entry last update
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