CVE catalog

CVE-2021-33586

inspircd: CVE-2021-33586

Severity: Medium
Published: May 27, 2021, 5:15:06 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.89% · Oct 25, 2026

InspIRCd 3.8.0 through 3.9.x before 3.10.0 allows any user (able to connect to the server) to access recently deallocated memory, aka the "malformed PONG" issue.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	inspircd	sid	`4.7.0+ds1-2`	fixed
Debian	inspircd	trixie	`4.7.0+ds1-2`	fixed
Debian	inspircd	bookworm	`3.15.0-1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	inspircd	source	sid	`3.8.1-2`	not yet assigned	Not reported	[989144]
Debian	inspircd	source	trixie	`3.8.1-2`	not yet assigned	Not reported	[989144]
Debian	inspircd	source	bookworm	`3.8.1-2`	not yet assigned	Not reported	[989144]

[Debian bug #989144]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[inspircd]Fixed
Details (2)
- 3.15.0-1 · amd64 · bookworm
  Fixed · Fixed: 3.8.1-2
  dsa · inspircd · debian · bookworm; dsa · inspircd · debian · 12
- 3.15.0-1 · arm64 · bookworm
  Fixed · Fixed: 3.8.1-2
  dsa · inspircd · debian · bookworm; dsa · inspircd · debian · 12
[inspircd-dev]Fixed
Source package: [inspircd]
Details (2)
- 3.15.0-1 · all · bookworm
  Fixed · Fixed: 3.8.1-2
  dsa · inspircd · debian · bookworm; dsa · inspircd · debian · 12
- 3.15.0-1 · all · bookworm
  Fixed · Fixed: 3.8.1-2
  dsa · inspircd · debian · bookworm; dsa · inspircd · debian · 12

[Debian 13 (Trixie)]

[inspircd]Fixed
Details (2)
- 4.7.0+ds1-2 · amd64 · trixie
  Fixed · Fixed: 3.8.1-2
  dsa · inspircd · debian · 13
- 4.7.0+ds1-2 · arm64 · trixie
  Fixed · Fixed: 3.8.1-2
  dsa · inspircd · debian · 13
[inspircd-dev]Fixed
Source package: [inspircd]
Details (2)
- 4.7.0+ds1-2 · all · trixie
  Fixed · Fixed: 3.8.1-2
  dsa · inspircd · debian · 13
- 4.7.0+ds1-2 · all · trixie
  Fixed · Fixed: 3.8.1-2
  dsa · inspircd · debian · 13

Observed: Oct 23, 2026, 5:57:52 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database]