6.5

CVE-2021-28166: eclipse mosquitto NULL Pointer Dereference

CVSS: 6.5v3.1MediumModified
AliasesALPINE-CVE-2021-28166UBUNTU-CVE-2021-28166DEBIAN-CVE-2021-28166
Published 07-04-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-28166 is a medium (CVSS 6.5) NULL Pointer Dereference vulnerability in eclipse mosquitto. EPSS estimates a 0.97% chance of exploitation in the next 30 days, higher than 61.2% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.97%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 07-04-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

In Eclipse Mosquitto version 2.0.0 to 2.0.9, if an authenticated client that had connected with MQTT v5 sent a crafted CONNACK message to the broker, a NULL pointer dereference would occur.

CVSS metrics

6 scores · 5 sources · 2 versions

EPSS trend

Probability

0.97%

Chance of exploitation in the next 30 days

Percentile

61%

Versus all other CVEs

30-day change

0.00 pp

From 0.97% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.97%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Alpine1 product
  • mosquitto≥ 2.0.0, < 2.0.10-r0
Debian1 product
  • mosquitto< 2.0.10-1
Eclipse1 product
The eclipse foundation1 product
Ubuntu1 product
  • mosquitto< 2.0.11-1ubuntu1

5 vendors · 5 products

References

5 links