nss: small-subgroups attack flaw
Published Aug 1, 2018
5.9
MEDIUMCVSS 3.0
EPSS 2.02%
Description
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.
Affected products
-
- Version 3.21.xStatusaffectedConstraints-
- Version
Configuration 1
- ≥ 3.21 · ≤ 3.21.4
Configuration 2
- 5.0
- 6.0
- 7.0
- 5.0
- 6.0
- 7.0
- 7.3
- 7.4
- 7.6
- 7.3
- 7.4
- 7.5
- 7.6
- 7.3
- 7.6
- 5.0
- 6.0
- 7.0
No data.
Red Hat Enterprise Linux 5
nss-0:3.21.3-2.el5_11
Fixed · RHSA-2016:2779
Red Hat Enterprise Linux 6
nss-0:3.21.3-2.el6_8
Fixed · RHSA-2016:2779
Red Hat Enterprise Linux 6
nss-util-0:3.21.3-1.el6_8
Fixed · RHSA-2016:2779
Red Hat Enterprise Linux 7
nss-0:3.21.3-2.el7_3
Fixed · RHSA-2016:2779
Red Hat Enterprise Linux 7
nss-util-0:3.21.3-1.1.el7_3
Fixed · RHSA-2016:2779
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | nss-0:3.21.3-2.el5_11 | Fixed | RHSA-2016:2779 |
| Red Hat Enterprise Linux 6 | nss-0:3.21.3-2.el6_8 | Fixed | RHSA-2016:2779 |
| Red Hat Enterprise Linux 6 | nss-util-0:3.21.3-1.el6_8 | Fixed | RHSA-2016:2779 |
| Red Hat Enterprise Linux 7 | nss-0:3.21.3-2.el7_3 | Fixed | RHSA-2016:2779 |
| Red Hat Enterprise Linux 7 | nss-util-0:3.21.3-1.1.el7_3 | Fixed | RHSA-2016:2779 |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
1 other source (Red Hat) ▾
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
AV:N/AC:M/Au:N/C:P/I:N/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (17 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.02% (0.02015) | 80.18th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.02% (0.02015) | 78.30th | v5 (v2026.06.15) |
| Mar 30, 2025 | 0.47% (0.00469) | 61.68th | v4 (v2025.03.14) |
| Mar 29, 2025 | 1.59% (0.01592) | 70.10th | v4 (v2025.03.14) |
| Mar 17, 2025 | 0.47% (0.00469) | 62.50th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.19% (0.00193) | 58.15th | v3 (v2023.03.01) |
| Feb 1, 2024 | 0.19% (0.00193) | 57.20th | v3 (v2023.03.01) |
| Dec 23, 2023 | 0.26% (0.00264) | 63.94th | v3 (v2023.03.01) |
| Jul 26, 2023 | 0.38% (0.00377) | 69.21th | v3 (v2023.03.01) |
| Jul 8, 2023 | 0.42% (0.00421) | 70.73th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.64% (0.00638) | 75.88th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.02% (0.01018) | 40.69th | v2 (v2022.01.01) |
| Feb 13, 2023 | 1.02% (0.01018) | 40.16th | v2 (v2022.01.01) |
| Feb 3, 2023 | 1.11% (0.01108) | 54.42th | v2 (v2022.01.01) |
| Sep 10, 2022 | 1.02% (0.01018) | 38.88th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.02% (0.01018) | 36.86th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.02% (0.01018) | 19.50th | v2 (v2022.01.01) |
References (8)
- http://rhn.redhat.com/errata/RHSA-2016-2779.html vendor-advisoryx_refsource_REDHATThird Party Advisory
- http://www.securityfocus.com/bid/94346 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2016-8635 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1391818 Issue Tracking
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-8635 x_refsource_CONFIRMIssue TrackingThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2016-8635
- https://security.gentoo.org/glsa/201701-46 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2016-8635
| Link | Providers | Tags |
|---|---|---|
| http://rhn.redhat.com/errata/RHSA-2016-2779.html | vendor-advisoryx_refsource_REDHATThird Party Advisory | |
| http://www.securityfocus.com/bid/94346 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| https://access.redhat.com/security/cve/CVE-2016-8635 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1391818 | Issue Tracking | |
| https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-8635 | x_refsource_CONFIRMIssue TrackingThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2016-8635 | ||
| https://security.gentoo.org/glsa/201701-46 | vendor-advisoryx_refsource_GENTOOThird Party Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2016-8635 |
Change history (0)
No recorded changes yet.