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CVE-2007-6721

26
FAUCET Score

CVE-2007-6721 describes a critical Bleichenbacher vulnerability affecting simple RSA CMS signatures without signed attributes in the Legion of the Bouncy Castle Java Cryptography API prior to release 1.38 and Crypto Provider Package before 1.36. This vulnerability carries a CVSS score of 10.0, indicating a severe risk with remote attack vectors, low attack complexity, and complete compromise of confidentiality, integrity, and availability. Despite its high severity and FAUCET Risk Score of 81/100, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.37CPE matchmatch criteria
cpe:2.3:a:bouncycastle:bc-java:*:*:*:*:*:*:*:*
1.01CPE matchmatch criteria
cpe:2.3:a:bouncycastle:bc-java:1.01:*:*:*:*:*:*:*
1.02CPE matchmatch criteria
cpe:2.3:a:bouncycastle:bc-java:1.02:*:*:*:*:*:*:*
1.03CPE matchmatch criteria
cpe:2.3:a:bouncycastle:bc-java:1.03:*:*:*:*:*:*:*
1.04CPE matchmatch criteria
cpe:2.3:a:bouncycastle:bc-java:1.04:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

10.0HIGH

AV:N/AC:L/Au:N/C:C/I:C/A:C

Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
10.0
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.41%
Probability of exploitation in next 30 days
EPSS Percentile
82.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0241 is in the 69th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

mavenpatch availablevia ghsa
Product: bouncycastle:bcprov-jdk14Fixed in: 1.38
mavenpatch availablevia ghsa
Product: bouncycastle:bcprov-jdk15Fixed in: 1.38
mavenpatch availablevia ghsa
Product: bouncycastle:bcprov-jdk16Fixed in: 1.38

Vendor Advisories (2)

mavenGHSA-m26p-m559-g5j5high

Legion of the Bouncy Castle Java Cryptography API Bleichenbacher Oracle Vulnerability

May 1, 2022
redhatCVE-2007-6721

bouncycastle: unknown vulnerability in simple RSA CMS signatures

Nov 7, 2007

References

freshmeat.net / projects/bouncycastlecryptoapi/releases/265580
bouncycastle.org / csharp
PatchVendor Advisory
bouncycastle.org / devmailarchive/msg08195.html
PatchVendor Advisory
bouncycastle.org / releasenotes.html
osvdb.org / 50358
osvdb.org / 50359
osvdb.org / 50360