Description
ejabberd_c2s.erl in ejabberd before 2.1.3 allows remote attackers to cause a denial of service (daemon crash) via a large number of c2s (aka client2server) messages that trigger a queue overload.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | ejabberd | 2.1.2-2 | — |
| Debian 13 | ejabberd | 2.1.2-2 | — |
| Debian 12 | ejabberd | 2.1.2-2 | — |
| Debian 5.0 | ejabberd | 2.0.1-6+lenny2 | DSA-2033-1 |
Advisories 1
- DSA-2033-1 ejabberd - denial of service Debian Security (DSA / DLA) · Mar 9, 2026
References
- [oss-security] 20100129 CVE Request -- ejabberd mailing-list
- 38337 third-party-advisory
- [oss-security] 20100129 Re: CVE Request -- ejabberd mailing-list
- 62066 vdb-entry
- ADV-2010-0894 vdb-entry
- ejabberd-client2server-dos(56025) vdb-entry
- DSA-2033 vendor-advisory
- https://support.process-one.net/browse/EJAB-1173
- 38003 vdb-entry
- 39423 third-party-advisory