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CVE-2016-6878

31
FAUCET Score

CVE-2016-6878 describes a critical vulnerability in the Curve25519 implementation of Botan versions prior to 1.11.31. Specifically, on systems lacking a native 128-bit integer type (e.g., 32-bit ARM with Clang), undefined behavior could lead to unspecified but severe impact, including potential compromise of confidentiality, integrity, and availability. With a CVSS score of 9.8 (Critical), this network-exploitable vulnerability is easy to exploit without user interaction. While there are no known public exploits (Metasploit, Nuclei, ExploitDB) or active exploitation (KEV, Hot List), the vulnerability has garnered significant community discussion with 10 mentions, indicating awareness among security researchers.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.11.30CPE matchmatch criteria
cpe:2.3:a:botan_project:botan:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.23%
Probability of exploitation in next 30 days
EPSS Percentile
65.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0123 is in the 52nd percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

botan.randombit.net / security.html
Third Party Advisory