What’s Vulnerable › Vulnerabilities

CVE-2015-2318

• Severity: high (CVSS 8.1 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-01-08 · updated 2026-06-17
• Weakness: CWE-295

Description

The TLS stack in Mono before 3.12.1 allows man-in-the-middle attackers to conduct message skipping attacks and consequently impersonate clients by leveraging missing handshake state validation, aka a "SMACK SKIP-TLS" issue.

Affected products

• Debian Linux: 6.0
• Mono-Project Mono: before 3.12.1 — fixed in 3.12.1

How to fix

Upgrade to a fixed version: Mono-Project Mono 3.12.1. Check the vendor advisory for mitigations.

References

• http://www.mono-project.com/news/2015/03/07/mono-tls-vulnerability/
• http://www.openwall.com/lists/oss-security/2015/03/17/9
• http://www.securityfocus.com/bid/73253
• http://www.ubuntu.com/usn/USN-2547-1
• https://bugzilla.redhat.com/show_bug.cgi?id=1202869
• https://github.com/mono/mono/commit/1509226c41d74194c146deb173e752b8d3cdeec4
• https://mitls.org/pages/attacks/SMACK#skip
• https://www.debian.org/security/2015/dsa-3202
• http://www.mono-project.com/news/2015/03/07/mono-tls-vulnerability/
• http://www.openwall.com/lists/oss-security/2015/03/17/9
• http://www.securityfocus.com/bid/73253
• http://www.ubuntu.com/usn/USN-2547-1

Get alerted when CVE-2015-2318 or the next vulnerability affects your stack