CVE-2007-6721

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."

Published: 2009-03-30 Last update: 2026-04-23 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2007-6721 is rated High Risk (70.5/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 2.48%). EPSS rose +1.62% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2007-6721

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.86% 2.48% +1.62%
2 2025-10-08 0.74% 0.86% +0.11%
3 2025-06-16 — 0.74% —

Full EPSS history (8 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2007-6721

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
10.0 2.0 HIGH
AV:N/AC:L/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 10.0 10.0 [email protected]

Weakness enumeration for CVE-2007-6721

GitHub Security Advisory for CVE-2007-6721

GHSA-m26p-m559-g5j5 · Severity: high · Ecosystem: maven — Legion of the Bouncy Castle Java Cryptography API Bleichenbacher Oracle Vulnerability

OS Trackers for CVE-2007-6721

vendor priority summary link
debian not yet assigned CVE-2007-6721 not yet assigned priority: Debian including 1 source packages (bouncycastle), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2007-6721
redhat — — https://access.redhat.com/security/cve/CVE-2007-6721

Affected software / configurations for CVE-2007-6721

Vendor Product Version Raw CPE
bouncycastle bc-java <= 1.37 cpe:2.3:a:bouncycastle:bc-java:*:*:*:*:*:*:*:*
bouncycastle bc-java 1.01 cpe:2.3:a:bouncycastle:bc-java:1.01:*:*:*:*:*:*:*
bouncycastle bc-java 1.02 cpe:2.3:a:bouncycastle:bc-java:1.02:*:*:*:*:*:*:*
bouncycastle bc-java 1.03 cpe:2.3:a:bouncycastle:bc-java:1.03:*:*:*:*:*:*:*
bouncycastle bc-java 1.04 cpe:2.3:a:bouncycastle:bc-java:1.04:*:*:*:*:*:*:*
bouncycastle bc-java 1.05 cpe:2.3:a:bouncycastle:bc-java:1.05:*:*:*:*:*:*:*
bouncycastle bc-java 1.06 cpe:2.3:a:bouncycastle:bc-java:1.06:*:*:*:*:*:*:*
bouncycastle bc-java 1.07 cpe:2.3:a:bouncycastle:bc-java:1.07:*:*:*:*:*:*:*
bouncycastle bc-java 1.08 cpe:2.3:a:bouncycastle:bc-java:1.08:*:*:*:*:*:*:*
bouncycastle bc-java 1.09 cpe:2.3:a:bouncycastle:bc-java:1.09:*:*:*:*:*:*:*
bouncycastle bc-java 1.10 cpe:2.3:a:bouncycastle:bc-java:1.10:*:*:*:*:*:*:*
bouncycastle bc-java 1.11 cpe:2.3:a:bouncycastle:bc-java:1.11:*:*:*:*:*:*:*
bouncycastle bc-java 1.12 cpe:2.3:a:bouncycastle:bc-java:1.12:*:*:*:*:*:*:*
bouncycastle bc-java 1.13 cpe:2.3:a:bouncycastle:bc-java:1.13:*:*:*:*:*:*:*
bouncycastle bc-java 1.14 cpe:2.3:a:bouncycastle:bc-java:1.14:*:*:*:*:*:*:*
bouncycastle bc-java 1.15 cpe:2.3:a:bouncycastle:bc-java:1.15:*:*:*:*:*:*:*
bouncycastle bc-java 1.16 cpe:2.3:a:bouncycastle:bc-java:1.16:*:*:*:*:*:*:*
bouncycastle bc-java 1.17 cpe:2.3:a:bouncycastle:bc-java:1.17:*:*:*:*:*:*:*
bouncycastle bc-java 1.18 cpe:2.3:a:bouncycastle:bc-java:1.18:*:*:*:*:*:*:*
bouncycastle bc-java 1.19 cpe:2.3:a:bouncycastle:bc-java:1.19:*:*:*:*:*:*:*
bouncycastle bc-java 1.20 cpe:2.3:a:bouncycastle:bc-java:1.20:*:*:*:*:*:*:*
bouncycastle bc-java 1.21 cpe:2.3:a:bouncycastle:bc-java:1.21:*:*:*:*:*:*:*
bouncycastle bc-java 1.22 cpe:2.3:a:bouncycastle:bc-java:1.22:*:*:*:*:*:*:*
bouncycastle bc-java 1.23 cpe:2.3:a:bouncycastle:bc-java:1.23:*:*:*:*:*:*:*
bouncycastle bc-java 1.24 cpe:2.3:a:bouncycastle:bc-java:1.24:*:*:*:*:*:*:*
bouncycastle bc-java 1.25 cpe:2.3:a:bouncycastle:bc-java:1.25:*:*:*:*:*:*:*
bouncycastle bc-java 1.26 cpe:2.3:a:bouncycastle:bc-java:1.26:*:*:*:*:*:*:*
bouncycastle bc-java 1.27 cpe:2.3:a:bouncycastle:bc-java:1.27:*:*:*:*:*:*:*
bouncycastle bc-java 1.28 cpe:2.3:a:bouncycastle:bc-java:1.28:*:*:*:*:*:*:*
bouncycastle bc-java 1.29 cpe:2.3:a:bouncycastle:bc-java:1.29:*:*:*:*:*:*:*
bouncycastle bc-java 1.30 cpe:2.3:a:bouncycastle:bc-java:1.30:*:*:*:*:*:*:*
bouncycastle bc-java 1.31 cpe:2.3:a:bouncycastle:bc-java:1.31:*:*:*:*:*:*:*
bouncycastle bc-java 1.32 cpe:2.3:a:bouncycastle:bc-java:1.32:*:*:*:*:*:*:*
bouncycastle bc-java 1.33 cpe:2.3:a:bouncycastle:bc-java:1.33:*:*:*:*:*:*:*
bouncycastle bc-java 1.34 cpe:2.3:a:bouncycastle:bc-java:1.34:*:*:*:*:*:*:*
bouncycastle bc-java 1.35 cpe:2.3:a:bouncycastle:bc-java:1.35:*:*:*:*:*:*:*
bouncycastle bc-java 1.36 cpe:2.3:a:bouncycastle:bc-java:1.36:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package <= 1.35 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:*:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.0 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.0:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.01 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.01:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.02 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.02:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.03 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.03:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.3.1 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.3.1:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.04 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.04:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.05 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.05:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.06 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.06:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.07 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.07:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.08 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.08:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.09 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.09:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.11 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.11:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.12 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.12:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.13 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.13:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.14 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.14:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.15 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.15:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.16 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.16:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.17 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.17:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.18 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.18:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.19 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.19:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.20 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.20:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.21 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.21:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.22 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.22:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.23 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.23:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.24 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.24:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.25 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.25:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.26 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.26:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.27 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.27:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.28 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.28:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.29 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.29:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.30 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.30:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.32 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.32:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.33 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.33:*:*:*:*:*:*:*
bouncycastle bouncy-castle-crypto-package 1.34 cpe:2.3:a:bouncycastle:bouncy-castle-crypto-package:1.34:*:*:*:*:*:*:*

References for CVE-2007-6721

cvelogic Threat Intelligence