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Fencer Vulns
high 8.8

CVE-2023-2905 json

Cesanta Mongoose MQTT Message Parsing Heap Overflow

published 2023-08-09 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-34351

cvss
8.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 63%
public exploits
0
none known

Summary

Due to a failure in validating the length of a provided MQTT_CMD_PUBLISH parsed message with a variable length header, Cesanta Mongoose, an embeddable web server, version 7.10 is susceptible to a heap-based buffer overflow vulnerability in the default configuration. Version 7.9 and prior does not appear to be vulnerable. This issue is resolved in version 7.11.

Patch / fix

  • Cesanta Mongoose 7.11
  • swupdate Debian 14, Debian 13 2024.12+dfsg-1

debian advisories DEBIAN-CVE-2023-2905

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-2905 updated cvss 5.3

mongoose: MQTT message parsing heap overflow

  • Red Hat Enterprise Linux OpenStack Platform 7 (Kilo) Operational Tools phantomjs Red Hat Storage 3 phantomjs
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
2 y ago

Exploit prediction

1.01% chance of exploitation in the next 30 days, higher than 63% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • takeonme.org https://takeonme.org/cves/CVE-2023-2905.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 8.8 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Cesanta Mongoose

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.