CVE-2004-2391: Jabber Gadu-Gadu Transport (a.k.a

Routine

MEDIUM 5.0DOWNGRADE

CVE-2004-2391 is a medium-severity flaw (CVSS 5.0) affecting jabber gadu-gadu transport. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Jabber Gadu-Gadu Transport (a.k.a. jabber-gg-transport) 2.0.x before 2.0.8 allows remote attackers to cause a denial of service a message with an empty <priority/> tag.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.6% (top 24%)
CISA exploited list	No
Published	2004-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: jabberstudio

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2004-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:09 UTCUpdated Record last modified

jabberstudio jabber gadu-gadu transport DOWNGRADE

Affected: 2.0 · 2.0.1 · 2.0.2 · 2.0.3 · 2.0.4 · 2.0.5 · 2.0.6 · 2.0.7

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

1. Check installed version

apt-cache policy jabber-gadu-gadu-transport || rpm -q jabber-gadu-gadu-transport || jabber-gadu-gadu-transport --version

2. No fixed release: DOWNGRADE to a release before 2.0 (Debian / Ubuntu)

apt-cache madison jabber-gadu-gadu-transport sudo apt install jabber-gadu-gadu-transport=<VERSION_BEFORE_2.0> sudo apt-mark hold jabber-gadu-gadu-transport

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list jabber-gadu-gadu-transport sudo dnf downgrade jabber-gadu-gadu-transport-<VERSION_BEFORE_2.0> sudo dnf versionlock add jabber-gadu-gadu-transport

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2004-2391?

jabber gadu-gadu transport: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2004-2391 being exploited?

CVE-2004-2391 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2004-2391 affect?

CVE-2004-2391 affects jabber gadu-gadu transport. Severity is medium (CVSS 5.0). Jabber Gadu-Gadu Transport (a.k.a. jabber-gg-transport) 2.0.x before 2.0.8 allows remote attackers to cause a denial of service a message with an empty <priority/> tag.

How urgent is CVE-2004-2391?

Priority 36/100. No elevated risk signals yet.

Related CVEs

CVE-2004-2390 MEDIUM 5.0 DOWNGRADE The roster import functionality in Jabber Gadu-Gadu Transport (a.k.a
CVE-2004-2389 MEDIUM 5.0 DOWNGRADE Unknown vulnerability in Jabber Gadu-Gadu Transport (a.k.a

References

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