Is CVE-2007-6721 in the CISA KEV catalog?

No. CVE-2007-6721 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2007-6721?

CVE-2007-6721 has a CVSS v2 base score of 10.0 (HIGH).

What is the EPSS score for CVE-2007-6721?

CVE-2007-6721 has an EPSS score of 2.41% (82th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2007-6721?

Upgrade bouncycastle on debian 11 to 1.38-1 or later.

CVE & CISA-KEV Catalog

CVE-2007-6721

HIGHEPSS 82th pctl

10.0

CVSS v2

NVD

Description

The Legion of the Bouncy Castle Java Cryptography API before release 1.38, as used in Crypto Provider Package before 1.36, has unknown impact and remote attack vectors related to "a Bleichenbacher vulnerability in simple RSA CMS signatures without signed attributes."

How to fix

Remediation Available

bouncycastleDebian

Fixed in:1.38-1CVE-2007-6721

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

2.41%probability of exploitation in 30 days

82ndpercentile

Elevated risk: more likely to be exploited than 82% of all known CVEs.

References

Patch2

Other references5

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-23.