Improper Certificate Validation Affecting mono package, versions <3.2.8+dfsg-10
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN14-MONO-11761023
- published10 Aug 2025
- disclosed8 Jan 2018
Introduced: 8 Jan 2018
CVE-2015-2318 (opens in a new tab)How to fix?
Upgrade Debian:14 mono to version 3.2.8+dfsg-10 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream mono package and not the mono package as distributed by Debian.
See How to fix? for Debian:14 relevant fixed versions and status.
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.
References
- https://security-tracker.debian.org/tracker/CVE-2015-2318
- https://www.debian.org/security/2015/dsa-3202
- https://github.com/mono/mono/commit/1509226c41d74194c146deb173e752b8d3cdeec4
- https://mitls.org/pages/attacks/SMACK#skip
- http://www.mono-project.com/news/2015/03/07/mono-tls-vulnerability/
- http://www.openwall.com/lists/oss-security/2015/03/17/9
- https://bugzilla.redhat.com/show_bug.cgi?id=1202869
- http://www.securityfocus.com/bid/73253
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2015-2318
- http://www.ubuntu.com/usn/USN-2547-1