CVE-2019-19307Mongoose Out-of-Bounds Read
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.
Published Nov 26, 2019 · Updated Aug 7, 2026 · Also known as DEBIAN-CVE-2019-19307
Key Facts
Patch in the next maintenance window- CVE-2019-19307 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Mongoose (Cesanta), swupdate (debian).
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 42% probability of exploitation in the next 30 days.
- Fixed versions are available, including swupdate 2021.04-1, Mongoose 0.
- Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.
Scores
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
42%
Higher than 98.6% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
41/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Proof of concept
Public exploit code
1
Proof-of-concept links
In-the-wild evidence
0
Reports of active use
Advisories And Exploit References
Description
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.
Affected Products
14 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| MongooseCesanta | 6.16 | 0 |
| swupdatedebian | See advisory | 2021.04-1 |
Patched Releases
swupdate
2021.04-1
Timeline
Publicly disclosed
Nov 26, 2019
Last updated
Aug 7, 2026
Weakness Type
- 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 ('Infinite Loop')
References
FAQ
Common Questions.
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.
Affected: Mongoose (Cesanta) versions 6.16; swupdate (debian). The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including swupdate 2021.04-1, Mongoose 0.
Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.
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