nss: ServerHello.random is all zeros when handling a v2-compatible ClientHello
Published Apr 29, 2019
5.9
MEDIUMCVSS 3.0
EPSS 1.48%
Description
When handling a SSLv2-compatible ClientHello request, the server doesn't generate a new random value but sends an all-zero value instead. This results in full malleability of the ClientHello for SSLv2 used for TLS 1.2 in all versions prior to NSS 3.39. This does not impact TLS 1.3.
Affected products
-
- Version All versions prior to NSS 3.39StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| NSS | Network Security Services (NSS) | n/a |
|
- < 3.39
No data.
Red Hat Enterprise Linux 6
nss-0:3.36.0-9.el6_10
Fixed · RHSA-2018:2898
Red Hat Enterprise Linux 7
nss-0:3.36.0-7.el7_5
Fixed · RHSA-2018:2768
Red Hat Enterprise Linux 5
nss
Not affected
Red Hat Enterprise Linux 8
nss
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | nss-0:3.36.0-9.el6_10 | Fixed | RHSA-2018:2898 |
| Red Hat Enterprise Linux 7 | nss-0:3.36.0-7.el7_5 | Fixed | RHSA-2018:2768 |
| Red Hat Enterprise Linux 5 | nss | Not affected | n/a |
| Red Hat Enterprise Linux 8 | nss | Not affected | n/a |
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:H/PR:N/UI:N/S:U/C:L/I:L/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
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.48% (0.01484) | 73.04th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.49% (0.01489) | 70.63th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.66% (0.00657) | 69.32th | v4 (v2025.03.14) |
| Dec 12, 2024 | 4.28% (0.04284) | 92.61th | v3 (v2023.03.01) |
| Jan 14, 2024 | 4.28% (0.04284) | 91.43th | v3 (v2023.03.01) |
| Dec 13, 2023 | 1.10% (0.01101) | 82.76th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.78% (0.00778) | 78.60th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00885) | 27.89th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.89% (0.00885) | 10.50th | v2 (v2022.01.01) |
| Feb 3, 2022 | 0.62% (0.00624) | 17.80th | v5 (v2026.06.15) |
| Apr 14, 2021 | 0.62% (0.00624) | 0.00th | v1 |
References (8)
- https://access.redhat.com/security/cve/CVE-2018-12384 Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=CVE-2018-12384 x_refsource_CONFIRMIssue TrackingVendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1622089 Issue Tracking
- https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.36.5_release_notes
- https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.39_release_notes
- https://nvd.nist.gov/vuln/detail/CVE-2018-12384
- https://www.cve.org/CVERecord?id=CVE-2018-12384
- https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html x_refsource_MISC
Change history (0)
No recorded changes yet.