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Vulnerability Assessment

Weakness
CWE
CWE-310
OWASP Top 10:2025
A04:2025 - Cryptographic Failures
ASVS 5.0
V11 - Cryptography Cryptographic controls
Impact

CVSS score of 4.3 (MEDIUM). Attack characteristics: network attack vector, M complexity. Public proof-of-concept exploit code is available. EPSS exploitation probability: 0.61%.
Exploit ScenarioDerived

This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the medium-severity affected system.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
No patch listed yet 0.6% exploitation probability (EPSS)

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AnalysisAI

Mozilla Network Security Services (NSS) before 3.19, as used in Mozilla Firefox before 39.0, Firefox ESR 31.x before 31.8 and 38.x before 38.1, Thunderbird before 38.1, and other products, does not. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable. Public exploit code available and no vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

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Technical ContextAI · show details

This vulnerability is classified under CWE-310. Mozilla Network Security Services (NSS) before 3.19, as used in Mozilla Firefox before 39.0, Firefox ESR 31.x before 31.8 and 38.x before 38.1, Thunderbird before 38.1, and other products, does not properly determine state transitions for the TLS state machine, which allows man-in-the-middle attackers to defeat cryptographic protection mechanisms by blocking messages, as demonstrated by removing a forward-secrecy property by blocking a ServerKeyExchange message, aka a "SMACK SKIP-TLS" issue. Affected products include: Novell Suse Linux Enterprise Software Development Kit, Canonical Ubuntu Linux, Debian Debian Linux, Novell Suse Linux Enterprise Desktop, Novell Suse Linux Enterprise Server. Version information: before 3.19.

Severity by source

NVD PRIMARY 4.3 MEDIUM
AV:N/AC:M/Au:N/C:N/I:P/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
M
Confidentiality
None
Integrity
P
Availability
None

DescriptionCVE.org

Mozilla Network Security Services (NSS) before 3.19, as used in Mozilla Firefox before 39.0, Firefox ESR 31.x before 31.8 and 38.x before 38.1, Thunderbird before 38.1, and other products, does not properly determine state transitions for the TLS state machine, which allows man-in-the-middle attackers to defeat cryptographic protection mechanisms by blocking messages, as demonstrated by removing a forward-secrecy property by blocking a ServerKeyExchange message, aka a "SMACK SKIP-TLS" issue.

Threat Intelligence Overview

EPSS Score
0.6%
Top 30% exploitable
Exploit
POC
Public exploit code exists
Data Quality
3 sources
Confidence: Low
NVD CVE.org EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC Yes
EPSS 0.6%
Patch available No
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
Poc
System Exposure· derived
Open
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

43
Low Medium High Critical
KEV: 0
EPSS: +1
CVSS: +22
PoC: +20
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Affected Products (CPE)CVE.org

cpe:2.3:a:novell:suse_linux_enterprise_software_development_kit:12.0:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:14.10:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:15.04:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:novell:suse_linux_enterprise_desktop:12.0:*:*:*:*:*:*:*
cpe:2.3:o:novell:suse_linux_enterprise_server:11:sp4:*:*:*:*:*:*
cpe:2.3:o:novell:suse_linux_enterprise_server:12.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:network_security_services:3.19:*:*:*:*:*:*:*
cpe:2.3:o:oracle:solaris:11.3:*:*:*:*:*:*:*
cpe:2.3:o:oracle:vm_server:3.2:*:*:*:*:*:*:*

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References

Advisories & patches
ADVISORY http://www.mozilla.org/security/announce/2015/mfsa2015-71.html REF http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00025.html REF http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00031.html REF http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00033.html REF http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00034.html REF http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00021.html REF http://rhn.redhat.com/errata/RHSA-2015-1185.html REF http://rhn.redhat.com/errata/RHSA-2015-1664.html REF http://www.debian.org/security/2015/dsa-3324 REF http://www.debian.org/security/2015/dsa-3336 REF http://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html REF http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html REF http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html REF http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html REF http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html REF http://www.securityfocus.com/bid/75541 REF http://www.securityfocus.com/bid/83398 REF http://www.securityfocus.com/bid/91787 REF http://www.securitytracker.com/id/1032783 REF http://www.securitytracker.com/id/1032784 REF http://www.ubuntu.com/usn/USN-2656-1 REF http://www.ubuntu.com/usn/USN-2656-2 REF http://www.ubuntu.com/usn/USN-2672-1 REF http://www.ubuntu.com/usn/USN-2673-1 REF https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.19_release_notes REF https://security.gentoo.org/glsa/201512-10 REF https://security.gentoo.org/glsa/201701-46 REF https://smacktls.com

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