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CVE-2015-2320

31
FAUCET Score

CVE-2015-2320 describes a critical vulnerability in the TLS stack of Mono before version 3.12.1, affecting Debian Linux and Mono Project products. This flaw allows remote attackers to achieve unspecified impact through client-side SSLv2 fallback, posing a significant risk to confidentiality, integrity, and availability. With a CVSS score of 9.8 (CRITICAL), it is easily exploitable over the network without user interaction. While there is no known active exploitation, public exploit code, or Metasploit/Nuclei modules, the vulnerability has garnered substantial community discussion, indicating awareness and potential for future exploitation.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.12.1CPE matchmatch criteria
cpe:2.3:a:mono-project:mono:*:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*

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
3.54%
Probability of exploitation in next 30 days
EPSS Percentile
88.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0354 is in the 80th percentile among its peer group of 36,829 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

bugzilla.redhat.com / show_bug.cgi
Issue TrackingThird Party Advisory
github.com / mono/mono/commit/b371da6b2d68b4cdd0f21d6342af6c42794f998b
Third Party Advisory
debian.org / security/2015/dsa-3202
Third Party Advisory
mono-project.com / news/2015/03/07/mono-tls-vulnerability
Vendor Advisory
openwall.com / lists/oss-security/2015/03/17/9
Mailing ListThird Party Advisory
securityfocus.com / bid/73256
Third Party AdvisoryVDB Entry
ubuntu.com / usn/USN-2547-1
Third Party Advisory