Mozilla Network Security Services (NSS) before 3.20.2, as used in Mozilla Firefox before 43.0.2 and Firefox ESR 38.x before 38.5.2, does not
Mozilla Network Security Services (NSS) before 3.20.2, as used in Mozilla Firefox before 43.0.2 and Firefox ESR 38.x before 38.5.2, does not reject MD5 signatures in Server Key Exchange messages in TLS 1.2 Handshake Protocol traffic, which makes it easier for man-in-the-middle attackers to spoof servers by triggering a collision.
- BDU:2016-00136
- DLA-410-1
- DSA-3436-1
- DSA-3437-1
- DSA-3457-1
- DSA-3458-1
- DSA-3465-1
- DSA-3491-1
- DSA-3688-1
- openSUSE-SU-2024:10088-1
- openSUSE-SU-2024:10451-1
- openSUSE-SU-2024:10486-1
- openSUSE-SU-2024:12903-1
- openSUSE-SU-2026:11119-1
- RHSA-2016:0007
- RHSA-2016:0008
- RHSA-2016:0012
- RHSA-2016:0049
- RHSA-2016:0050
- RHSA-2016:0053
- Published
- Jan 8, 2016
- Updated
- Jun 16, 2026
- EPSS
- 2.9% · 86th percentile
- CWE
- CWE-19
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Report tools
Action score
24
Monitor
Low priority for now.
- CVSS
- 23 / 40 · 5.9 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 2.9%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| mozilla | network security services | cpe:2.3:a:mozilla:network_security_services |
| mozilla | firefox | cpe:2.3:a:mozilla:firefox |
| opensuse | leap | cpe:2.3:o:opensuse:leap |
| opensuse | opensuse | cpe:2.3:o:opensuse:opensuse |
| canonical | ubuntu linux | cpe:2.3:o:canonical:ubuntu_linux |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- canonical ubuntu linux14.04
- canonical ubuntu linux15.04
- canonical ubuntu linux15.10
- mozilla firefoxup to 43.0.1 inclusive
- mozilla firefox38.0
- mozilla firefox38.0.1
- mozilla firefox38.0.5
- mozilla firefox38.1.0
- mozilla firefox38.1.1
- mozilla firefox38.2.0
- mozilla firefox38.2.1
- mozilla firefox38.3.0
- mozilla firefox38.4.0
- mozilla firefox38.5.0
- mozilla firefox38.5.1
- mozilla network security servicesup to 3.20.1 inclusive
- opensuse leap42.1
- opensuse opensuse13.1
- opensuse opensuse13.2
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | gnutls28 | before 3.3.15-1 | 3.3.15-1 |
| Debian:12 | nss | before 2:3.21-1 | 2:3.21-1 |
| Debian:12 | openssl | before 1.0.1f-1 | 1.0.1f-1 |
| Debian:6.0 | openjdk-6 | before 6b38-1.13.10-1~deb6u1 | 6b38-1.13.10-1~deb6u1 |
| Debian:7 | gnutls26 | before 2.12.20-8+deb7u5 | 2.12.20-8+deb7u5 |
| Debian:7 | icedove | before 38.6.0-1~deb7u1 | 38.6.0-1~deb7u1 |
| Debian:7 | iceweasel | before 38.6.0esr-1~deb7u1 | 38.6.0esr-1~deb7u1 |
| Debian:7 | openjdk-6 | before 6b38-1.13.10-1~deb7u1 | 6b38-1.13.10-1~deb7u1 |
| Debian:7 | openjdk-7 | before 7u95-2.6.4-1~deb7u1 | 7u95-2.6.4-1~deb7u1 |
| Debian:7 | openssl | before 1.0.1e-2+deb7u19 | 1.0.1e-2+deb7u19 |
| Debian:8 | icedove | before 38.6.0-1~deb8u1 | 38.6.0-1~deb8u1 |
| Debian:8 | iceweasel | before 38.6.0esr-1~deb8u1 | 38.6.0esr-1~deb8u1 |
| Debian:8 | nss | before 2:3.26-1+debu8u1 | 2:3.26-1+debu8u1 |
| Debian:8 | openjdk-7 | before 7u95-2.6.4-1~deb8u1 | 7u95-2.6.4-1~deb8u1 |
| openSUSE:Tumbleweed | bouncycastle | before 1.54-1.2 | 1.54-1.2 |
| openSUSE:Tumbleweed | mbedtls | before 2.4.0-1.2 | 2.4.0-1.2 |
| openSUSE:Tumbleweed | mbedtls-2 | before 2.28.3-1.1 | 2.28.3-1.1 |
| openSUSE:Tumbleweed | mbedtls-3 | before 3.6.6-1.1 | 3.6.6-1.1 |
| openSUSE:Tumbleweed | mozilla-nss | before 3.26.2-1.1 | 3.26.2-1.1 |
| Red Hat:enterprise_linux:5::client | java-1.7.0-openjdk | before 1:1.7.0.95-2.6.4.1.el5_11 | 1:1.7.0.95-2.6.4.1.el5_11 |
| Red Hat:enterprise_linux:5::client | java-1.7.0-openjdk-debuginfo | before 1:1.7.0.95-2.6.4.1.el5_11 | 1:1.7.0.95-2.6.4.1.el5_11 |
| Red Hat:enterprise_linux:5::client | java-1.7.0-openjdk-demo | before 1:1.7.0.95-2.6.4.1.el5_11 | 1:1.7.0.95-2.6.4.1.el5_11 |
| Red Hat:enterprise_linux:5::client | java-1.7.0-openjdk-devel | before 1:1.7.0.95-2.6.4.1.el5_11 | 1:1.7.0.95-2.6.4.1.el5_11 |
| Red Hat:enterprise_linux:5::client | java-1.7.0-openjdk-javadoc | before 1:1.7.0.95-2.6.4.1.el5_11 | 1:1.7.0.95-2.6.4.1.el5_11 |
+96
Same product
mozilla: all recordsOther highest-scoring records for the same primary product.
- CVE-2017-5461Mozilla Network Security Services (NSS) before 3.21.4, 3.22.x through 3.28.x before 3.28.4, 3.29.x before 3.29.5, and 3.30.x before 3.30.1 a40Plan
- CVE-2009-2404Heap-based buffer overflow in a regular-expression parser in Mozilla Network Security Services (NSS) before 3.12.3, as used in Firefox, Thun38Monitor
- CVE-2018-12404A cached side channel attack during handshakes using RSA encryption could allow for the decryption of encrypted content.36Monitor
- CVE-2016-2834Mozilla Network Security Services (NSS) before 3.23, as used in Mozilla Firefox before 47.0, allows remote attackers to cause a denial of se36Monitor
- CVE-2016-1950Heap-based buffer overflow in Mozilla Network Security Services (NSS) before 3.19.2.3 and 3.20.x and 3.21.x before 3.21.1, as used in Mozill36Monitor
- CVE-2015-7181The sec_asn1d_parse_leaf function in Mozilla Network Security Services (NSS) before 3.19.2.1 and 3.20.x before 3.20.1, as used in Firefox be32Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:gnutls26 | 2.12.20-8+deb7u5 · Debian:7 | Package registry (OSV) |
| debian:gnutls28 | 3.3.15-1 · Debian:12 | Package registry (OSV) |
| debian:icedove | 38.6.0-1~deb7u1 · Debian:7 | Package registry (OSV) |
| debian:iceweasel | 38.6.0esr-1~deb7u1 · Debian:7 | Package registry (OSV) |
| debian:nss | 2:3.21-1 · Debian:12 | Package registry (OSV) |
| debian:openjdk-6 | 6b38-1.13.10-1~deb6u1 · Debian:6.0 | Package registry (OSV) |
| debian:openjdk-7 | 7u95-2.6.4-1~deb7u1 · Debian:7 | Package registry (OSV) |
| debian:openssl | 1.0.1f-1 · Debian:12 | Package registry (OSV) |
| opensuse:bouncycastle | 1.54-1.2 · openSUSE:Tumbleweed | Package registry (OSV) |
| opensuse:mbedtls | 2.4.0-1.2 · openSUSE:Tumbleweed | Package registry (OSV) |
| opensuse:mbedtls-2 | 2.28.3-1.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| opensuse:mbedtls-3 | 3.6.6-1.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| opensuse:mozilla-nss | 3.26.2-1.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| red hat:nss | 0:3.19.1-8.el6_7 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:nss-debuginfo | 0:3.19.1-8.el6_7 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:nss-devel | 0:3.19.1-8.el6_7 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:nss-pkcs11-devel | 0:3.19.1-8.el6_7 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:nss-sysinit | 0:3.19.1-8.el6_7 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:nss-tools | 0:3.19.1-8.el6_7 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:openssl | 0:1.0.1e-42.el6_7.2 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:openssl-debuginfo | 0:1.0.1e-42.el6_7.2 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:openssl-devel | 0:1.0.1e-42.el6_7.2 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:openssl-libs | 1:1.0.1e-51.el7_2.2 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:openssl-perl | 0:1.0.1e-42.el6_7.2 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:openssl-static | 0:1.0.1e-42.el6_7.2 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| suse:java-1_6_0-ibm | 1.6.0_sr16.20-30.1 · SUSE:Linux Enterprise Module for Legacy 12 | Package registry (OSV) |
| suse:java-1_7_0-ibm | 1.7.0_sr9.30-45.1 · SUSE:Linux Enterprise Server 11 SP2-LTSS | Package registry (OSV) |
| suse:java-1_7_0-openjdk | 1.7.0.95-24.2 · SUSE:Linux Enterprise Desktop 12 | Package registry (OSV) |
| suse:java-1_7_1-ibm | 1.7.1_sr3.30-9.1 · SUSE:Linux Enterprise Software Development Kit 11 SP4 | Package registry (OSV) |
| suse:java-1_8_0-ibm | 1.8.0_sr2.10-7.1 · SUSE:Linux Enterprise Software Development Kit 12 SP1 | Package registry (OSV) |
+4
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- Special conditions such as timing or configuration are required.
If successful
- Confidentiality
- high · data can be read
- Integrity
- none
- Availability
- none
- Attack vector
- Network
- Attack complexity
- High
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- None
- Availability impact
- None
Weakness class (CWE)
CWE-19 · Data Processing ErrorsCVSS vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- lists.opensuse.org/opensuse-security-announce/2016-01/msg00038.html
- lists.opensuse.org/opensuse-security-announce/2016-01/msg00041.html
- lists.opensuse.org/opensuse-security-announce/2016-01/msg00042.html
- lists.opensuse.org/opensuse-security-announce/2016-01/msg00043.html
- lists.opensuse.org/opensuse-security-announce/2016-01/msg00044.html
- lists.opensuse.org/opensuse-security-announce/2016-01/msg00045.html
- lists.opensuse.org/opensuse-security-announce/2016-01/msg00047.html
- lists.opensuse.org/opensuse-security-announce/2016-01/msg00048.html
- lists.opensuse.org/opensuse-updates/2015-12/msg00139.html
- lists.opensuse.org/opensuse-updates/2016-01/msg00005.html
- lists.opensuse.org/opensuse-updates/2016-01/msg00058.html
- lists.opensuse.org/opensuse-updates/2016-01/msg00059.html
- lists.opensuse.org/opensuse-updates/2016-02/msg00007.html
- lists.opensuse.org/opensuse-updates/2016-02/msg00008.html
- lists.opensuse.org/opensuse-updates/2016-02/msg00101.html
- lists.opensuse.org/opensuse-updates/2016-02/msg00166.html
- rhn.redhat.com/errata/RHSA-2016-0049.html
- rhn.redhat.com/errata/RHSA-2016-0050.html
- rhn.redhat.com/errata/RHSA-2016-0053.html
- rhn.redhat.com/errata/RHSA-2016-0054.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.