nss: Potential use-after-free in TLS 1.2 server when verifying client authentication
Published Jun 11, 2018
7.5
HIGHCVSS 3.0
EPSS 3.11%
Description
During TLS 1.2 exchanges, handshake hashes are generated which point to a message buffer. This saved data is used for later messages but in some cases, the handshake transcript can exceed the space available in the current buffer, causing the allocation of a new buffer. This leaves a pointer pointing to the old, freed buffer, resulting in a use-after-free when handshake hashes are then calculated afterwards. This can result in a potentially exploitable crash. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4.
Affected products
-
- Version unspecifiedStatusaffectedConstraints<56
- Version
-
- Version unspecifiedStatusaffectedConstraints<52.4
- Version
-
- Version unspecifiedStatusaffectedConstraints<52.4
- 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 | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Mozilla | Firefox | n/a |
| ||||||
| Mozilla | Firefox ESR | n/a |
| ||||||
| Mozilla | Thunderbird | n/a |
|
Configuration 1
Configuration 2
- 7.0
- 8.0
- 9.0
No data.
Red Hat Enterprise Linux 6
nss-0:3.28.4-4.el6_9
Fixed · RHSA-2017:2832
Red Hat Enterprise Linux 7
nss-0:3.28.4-12.el7_4
Fixed · RHSA-2017:2832
Red Hat Enterprise Linux 5
nss
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | nss-0:3.28.4-4.el6_9 | Fixed | RHSA-2017:2832 |
| Red Hat Enterprise Linux 7 | nss-0:3.28.4-12.el7_4 | Fixed | RHSA-2017:2832 |
| Red Hat Enterprise Linux 5 | nss | Will not fix | 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:L/PR:N/UI:N/S:U/C:N/I:N/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
AV:N/AC:L/Au:N/C:N/I:N/A:P
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 (17 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 3.11% (0.03113) | 87.34th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.15% (0.03153) | 86.24th | v5 (v2026.06.15) |
| Sep 8, 2025 | 3.85% (0.03851) | 87.75th | v4 (v2025.03.14) |
| Mar 30, 2025 | 4.91% (0.04906) | 88.60th | v4 (v2025.03.14) |
| Mar 29, 2025 | 9.10% (0.09099) | 87.64th | v4 (v2025.03.14) |
| Mar 17, 2025 | 5.00% (0.04997) | 88.97th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.97% (0.00969) | 84.02th | v3 (v2023.03.01) |
| Jun 26, 2024 | 0.95% (0.00955) | 83.32th | v3 (v2023.03.01) |
| Jan 29, 2024 | 1.35% (0.01350) | 84.73th | v3 (v2023.03.01) |
| Dec 12, 2023 | 1.24% (0.01244) | 83.91th | v3 (v2023.03.01) |
| Nov 2, 2023 | 1.69% (0.01691) | 86.33th | v3 (v2023.03.01) |
| Sep 3, 2023 | 1.60% (0.01600) | 85.81th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.27% (0.01271) | 83.53th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.69% (0.02686) | 82.85th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.69% (0.02686) | 62.66th | v2 (v2022.01.01) |
| Feb 3, 2022 | 2.88% (0.02880) | 63.65th | v5 (v2026.06.15) |
| Apr 14, 2021 | 2.88% (0.02880) | 0.00th | v1 |
References (17)
- http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html x_refsource_CONFIRM
- http://www.securityfocus.com/bid/101059 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1039465 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2017:2832 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2017-7805 Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1377618 x_refsource_CONFIRMIssue TrackingVendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1471171 Issue Tracking
- https://lists.debian.org/debian-lts-announce/2017/11/msg00000.html mailing-listx_refsource_MLISTThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2017-7805
- https://security.gentoo.org/glsa/201803-14 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2017-7805
- https://www.debian.org/security/2017/dsa-3987 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- https://www.debian.org/security/2017/dsa-3998 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- https://www.debian.org/security/2017/dsa-4014 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-21/ x_refsource_CONFIRMVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-22/ x_refsource_CONFIRMVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-23/ x_refsource_CONFIRMVendor Advisory
Change history (0)
No recorded changes yet.