How severe is CVE-2004-2721?

CVE-2004-2721 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2004-2721 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2004-2721?

CVE-2004-2721 affects Heiko Stamer Openskat. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2004-2721?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2004-2721 published?

CVE-2004-2721 was published on 2004-12-31 and last updated on 2026-06-16.

CVE-2004-2721

CVE-2004-2721 is a medium-severity vulnerability in Heiko Stamer Openskat with a CVSS 2.0 base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-310.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-310
Affected product: Heiko Stamer Openskat
Published: 2004-12-31
Last modified: 2026-06-16

Description

The CheckGroup function in openSkat VTMF before 2.1 generates public key pairs in which the "p" variable might not be prime, which allows remote attackers to determine the private key and decrypt messages.

Frequently asked questions

What is CVE-2004-2721?: The CheckGroup function in openSkat VTMF before 2.1 generates public key pairs in which the "p" variable might not be prime, which allows remote attackers to determine the private key and decrypt messages.
How severe is CVE-2004-2721?: CVE-2004-2721 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2004-2721 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2004-2721?: CVE-2004-2721 affects Heiko Stamer Openskat. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2004-2721?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2004-2721 published?: CVE-2004-2721 was published on 2004-12-31 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:heiko_stamer:openskat:*:*:*:*:*:*:*:*

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