An integer overflow in parse_mqtt in mongoose.c in Cesanta Mongoose 6.16 allows an attacker to achieve remote DoS (infinite loop), or possi…

published 2019-11-26 6 y ago modified 2026-06-17 4 mo ago also EUVD-2019-8931

cvss: 9.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 42.2%; EPSS 42.2% chance of exploitation in 30 days, percentile 98%
public exploits: 0; none known

An integer overflow in parse_mqtt in mongoose.c in Cesanta Mongoose 6.16 allows an attacker to achieve remote DoS (infinite loop), or possibly cause an out-of-bounds write, by sending a crafted MQTT protocol packet.

Patch / fix

distros 1

swupdate Debian 14, Debian 13, Debian 12 2021.04-1

debian advisories DEBIAN-CVE-2019-19307

Exploit prediction

42.25% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/cesanta/mongoose/issues/1055 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	7.5	AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness

CWE-125 Out-of-bounds Read
CWE-190 Integer Overflow or Wraparound
CWE-787 Out-of-bounds Write
CWE-835 Loop with Unreachable Exit Condition

References

github.com /cesanta/mongoose/issues/1055
exploit, third-party-advisory

Sources

CVE List CVE-2019-19307
NVD CVE-2019-19307

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.

Summary