It was found that Diffie Hellman Client key exchange handling in NSS 3.21.x was…
Priority LOW 30CWE-358Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA and Red Hat.
Summary
It was found that Diffie Hellman Client key exchange handling in NSS 3.21.x was vulnerable to small subgroup confinement attack. An attacker could use this flaw to recover private keys by confining the client DH key to small subgroup of the desired group.
Why it matters now
EPSS 0.01989 80th percentileScored 2026-11-07
Fix Fixed Red Hat: 1 advisory
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Mozilla | nss | 3.21.x | — | No fix listed | CNA |
- nss VendorMozilla Affected 3.21.x Fixed in — No fix listed CNA
CPE configurations NVD · 19
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mozilla:network_security_services:*:*:*:*:*:*:*:* | 3.21 – 3.21.4 | Vulnerable | Mozilla |
| cpe:2.3:o:redhat:enterprise_linux_desktop:5.0:*:*:*:*:*:*:* | 5.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:* | 6.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:* | 7.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server:5.0:*:*:*:*:*:*:* | 5.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:* | 6.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:* | 7.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server_aus:7.3:*:*:*:*:*:*:* | 7.3 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server_aus:7.4:*:*:*:*:*:*:* | 7.4 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:* | 7.6 | Vulnerable | Red Hat |
- cpe:2.3:a:mozilla:network_security_services:*:*:*:*:*:*:*:* Versions 3.21 – 3.21.4 Vulnerable ·Mozilla
- cpe:2.3:o:redhat:enterprise_linux_desktop:5.0:*:*:*:*:*:*:* Versions 5.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server:5.0:*:*:*:*:*:*:* Versions 5.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server_aus:7.3:*:*:*:*:*:*:* Versions 7.3 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server_aus:7.4:*:*:*:*:*:*:* Versions 7.4 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:* Versions 7.6 Vulnerable ·Red Hat
Show 9 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:redhat:enterprise_linux_server_eus:7.3:*:*:*:*:*:*:* | 7.3 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server_eus:7.4:*:*:*:*:*:*:* | 7.4 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server_eus:7.5:*:*:*:*:*:*:* | 7.5 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:*:*:*:*:*:*:* | 7.6 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server_tus:7.3:*:*:*:*:*:*:* | 7.3 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:* | 7.6 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_workstation:5.0:*:*:*:*:*:*:* | 5.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:* | 6.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:* | 7.0 | Vulnerable | Red Hat |
- cpe:2.3:o:redhat:enterprise_linux_server_eus:7.3:*:*:*:*:*:*:* Versions 7.3 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server_eus:7.4:*:*:*:*:*:*:* Versions 7.4 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server_eus:7.5:*:*:*:*:*:*:* Versions 7.5 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:*:*:*:*:*:*:* Versions 7.6 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server_tus:7.3:*:*:*:*:*:*:* Versions 7.3 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:* Versions 7.6 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_workstation:5.0:*:*:*:*:*:*:* Versions 5.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
Remediation
Red Hat 1 advisory
- RHSA-2016:2779 Released 2016-11-16 · Red Hat rating Moderatenss and nss-util security update
- Red Hat Enterprise Linux (v. 5 server) nss-3.21.3-2.el5_11, nss-3.21.3-2.el5_11.i386, nss-3.21.3-2.el5_11.ia64 +13
- Red Hat Enterprise Linux Client (v. 7) nss-3.21.3-2.el7_3, nss-sysinit-3.21.3-2.el7_3, nss-tools-3.21.3-2.el7_3 +1
- Red Hat Enterprise Linux Client Optional (v. 7) nss-devel-3.21.3-2.el7_3, nss-pkcs11-devel-3.21.3-2.el7_3, nss-util-devel-3.21.3-1.1.el7_3
- Red Hat Enterprise Linux ComputeNode (v. 7) nss-3.21.3-2.el7_3, nss-sysinit-3.21.3-2.el7_3, nss-tools-3.21.3-2.el7_3 +1
- Red Hat Enterprise Linux ComputeNode Optional (v. 7) nss-devel-3.21.3-2.el7_3, nss-pkcs11-devel-3.21.3-2.el7_3, nss-util-devel-3.21.3-1.1.el7_3
- Red Hat Enterprise Linux Desktop (v. 5 client) nss-3.21.3-2.el5_11, nss-3.21.3-2.el5_11.i386, nss-tools-3.21.3-2.el5_11 +1
- Red Hat Enterprise Linux Desktop (v. 6) nss-3.21.3-2.el6_8, nss-sysinit-3.21.3-2.el6_8, nss-tools-3.21.3-2.el6_8 +1
- Red Hat Enterprise Linux Desktop Optional (v. 6) nss-devel-3.21.3-2.el6_8, nss-pkcs11-devel-3.21.3-2.el6_8, nss-util-devel-3.21.3-1.el6_8
- Red Hat Enterprise Linux Desktop Workstation (v. 5 client) nss-3.21.3-2.el5_11, nss-devel-3.21.3-2.el5_11, nss-devel-3.21.3-2.el5_11.i386 +2
- Red Hat Enterprise Linux HPC Node (v. 6) nss-3.21.3-2.el6_8, nss-sysinit-3.21.3-2.el6_8, nss-tools-3.21.3-2.el6_8 +1
- Red Hat Enterprise Linux HPC Node Optional (v. 6) nss-devel-3.21.3-2.el6_8, nss-pkcs11-devel-3.21.3-2.el6_8, nss-util-devel-3.21.3-1.el6_8
- Red Hat Enterprise Linux Server (v. 6) nss-3.21.3-2.el6_8, nss-3.21.3-2.el6_8.ppc, nss-devel-3.21.3-2.el6_8 +7
- Red Hat Enterprise Linux Server (v. 7) nss-3.21.3-2.el7_3, nss-3.21.3-2.el7_3.ppc, nss-devel-3.21.3-2.el7_3 +7
- Red Hat Enterprise Linux Server Optional (v. 6) nss-pkcs11-devel-3.21.3-2.el6_8, nss-pkcs11-devel-3.21.3-2.el6_8.ppc
- Red Hat Enterprise Linux Server Optional (v. 7) nss-pkcs11-devel-3.21.3-2.el7_3, nss-pkcs11-devel-3.21.3-2.el7_3.ppc
- Red Hat Enterprise Linux Workstation (v. 6) nss-3.21.3-2.el6_8, nss-devel-3.21.3-2.el6_8, nss-sysinit-3.21.3-2.el6_8 +3
- Red Hat Enterprise Linux Workstation (v. 7) nss-3.21.3-2.el7_3, nss-devel-3.21.3-2.el7_3, nss-sysinit-3.21.3-2.el7_3 +3
- Red Hat Enterprise Linux Workstation Optional (v. 6) nss-pkcs11-devel-3.21.3-2.el6_8
- Red Hat Enterprise Linux Workstation Optional (v. 7) nss-pkcs11-devel-3.21.3-2.el7_3
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux (v. 5 server) | Fixed | RHSA-2016:2779 |
| Red Hat Enterprise Linux Client (v. 7) | Fixed | RHSA-2016:2779 |
| Red Hat Enterprise Linux Client Optional (v. 7) | Fixed | RHSA-2016:2779 |
| Red Hat Enterprise Linux ComputeNode (v. 7) | Fixed | RHSA-2016:2779 |
| Red Hat Enterprise Linux ComputeNode Optional (v. 7) | Fixed | RHSA-2016:2779 |
| Red Hat Enterprise Linux Desktop (v. 5 client) | Fixed | RHSA-2016:2779 |
| Red Hat Enterprise Linux Desktop (v. 6) | Fixed | RHSA-2016:2779 |
| Red Hat Enterprise Linux Desktop Optional (v. 6) | Fixed | RHSA-2016:2779 |
| Red Hat Enterprise Linux Desktop Workstation (v. 5 client) | Fixed | RHSA-2016:2779 |
| Red Hat Enterprise Linux HPC Node (v. 6) | Fixed | RHSA-2016:2779 |
| Red Hat Enterprise Linux HPC Node Optional (v. 6) | Fixed | RHSA-2016:2779 |
| Red Hat Enterprise Linux Server (v. 6) | Fixed | RHSA-2016:2779 |
| Red Hat Enterprise Linux Server (v. 7) | Fixed | RHSA-2016:2779 |
| Red Hat Enterprise Linux Server Optional (v. 6) | Fixed | RHSA-2016:2779 |
| Red Hat Enterprise Linux Server Optional (v. 7) | Fixed | RHSA-2016:2779 |
| Red Hat Enterprise Linux Workstation (v. 6) | Fixed | RHSA-2016:2779 |
| Red Hat Enterprise Linux Workstation (v. 7) | Fixed | RHSA-2016:2779 |
| Red Hat Enterprise Linux Workstation Optional (v. 6) | Fixed | RHSA-2016:2779 |
| Red Hat Enterprise Linux Workstation Optional (v. 7) | Fixed | RHSA-2016:2779 |
Timeline
- 2026-10-02 Threatist record created from CVE-2016-8635
- 2026-10-03 Alias added: GHSA-j6rc-c6gr-mf89
References
More Mozilla Network Security Services vulnerabilities
- TI-2015-03381 The TLS protocol 1.2 and earlier, when a DHE_EXPORT ciphersuite is enabled on a server… CVSS 3.1LOW 3.7
- TI-2007-00009 Stack-based buffer overflow in the SSLv2 support in Mozilla Network Security Services… CVSS 2.0MEDIUM 6.8
- TI-2018-08903 A cached side channel attack during handshakes using RSA encryption could allow for the… CVSS 3.0MEDIUM 5.9
- TI-2015-05957 Heap-based buffer overflow in the ASN.1 decoder in Mozilla Network Security Services… CVSS 3.0CRITICAL 9.8
- TI-2004-00763 Heap-based buffer overflow in Netscape Network Security Services (NSS) library allows… CVSS 2.0HIGH 7.5
- TI-2014-01197 Use-after-free vulnerability in the CERT_DestroyCertificate function in libnss3.so in… CVSS 2.0HIGH 10.0
Sources
- CVE-2016-8635 · CVE Program
- CVE-2016-8635 · NVD
- FIRST EPSS
- GHSA-j6rc-c6gr-mf89 · GitHub Advisory Database · CC BY 4.0
- CVE-2016-8635 · Red Hat security data · CC BY 4.0
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