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Fencer Vulns
high 7.5

CVE-2017-7805 json

During TLS 1.2 exchanges, handshake hashes are generated which point to a message buffer.

published 2018-06-11 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-16780

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.0%
EPSS 3.0% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

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.

Patch / fix

  • Mozilla Firefox 56
  • Mozilla Firefox ESR 52.4
  • Mozilla Thunderbird 52.4
  • nss Debian 14, Debian 13, Debian 12 2:3.33-1
  • firefox-esr Debian 14, Debian 13, Debian 12 52.4.0esr-2
  • thunderbird Debian 14, Debian 13, Debian 12 1:52.4.0-1

debian advisories DEBIAN-CVE-2017-7805

  • nss Ubuntu 14.04 LTS 2:3.28.4-0ubuntu0.14.04.3
  • nss Ubuntu 16.04 LTS 2:3.28.4-0ubuntu0.16.04.3
  • nss Ubuntu 18.04 LTS 2:3.32-1ubuntu3
  • firefox Ubuntu 14.04 LTS 56.0+build6-0ubuntu0.14.04.1
  • firefox Ubuntu 16.04 LTS 56.0+build6-0ubuntu0.16.04.1
  • firefox Ubuntu 18.04 LTS 56.0+build6-0ubuntu1
  • thunderbird Ubuntu 14.04 LTS 1:52.4.0+build1-0ubuntu0.14.04.2
  • thunderbird Ubuntu 16.04 LTS 1:52.4.0+build1-0ubuntu0.16.04.2

ubuntu advisories UBUNTU-CVE-2017-7805

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • nss RHEL 6 3.28.4-4.el6_9
  • nss RHEL 7 3.28.4-12.el7_4
  • nss-tools RHEL 6 3.28.4-4.el6_9
  • nss-tools RHEL 7 3.28.4-12.el7_4
  • nss-sysinit RHEL 6 3.28.4-4.el6_9
  • nss-sysinit RHEL 7 3.28.4-12.el7_4

red hat advisories RHSA-2017:2832

  • mozilla-nss SLES 11 SP4, SLES 11 SP3-TERADATA, SLE Software Development Kit 11 SP4 +3 more 3.29.5-47.6.1
  • MozillaFirefox SLES 11 SP4, SLES 11 SP3-TERADATA, SLE Software Development Kit 11 SP4 +3 more 52.4.0esr-72.13.2
  • mozilla-nss SLES for SAP 12 SP3, SLES for SAP 12 SP2, SLES for SAP 12 SP1 +10 more 3.29.5-58.3.1
  • MozillaFirefox SLES for SAP 12 SP3, SLES for SAP 12 SP2, SLES for SAP 12 SP1 +10 more 52.4.0esr-109.6.2

suse advisories SUSE-SU-2017:2872-1SUSE-SU-2017:2872-2SUSE-SU-2017:2688-1

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 92.0-1.2
  • MozillaThunderbird openSUSE Tumbleweed 91.1.1-1.1
  • MozillaThunderbird Package Hub 12 52.4.0-45.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10600-1openSUSE-SU-2024:10601-1openSUSE-SU-2017:2707-1openSUSE-SU-2017:2710-1

  • thunderbird Arch Linux 52.4.0-1

arch linux advisories AVG-441

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-7805 updated cvss 7.5

nss: Potential use-after-free in TLS 1.2 server when verifying client authentication

  • Red Hat Enterprise Linux 5 nss
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux Client (v. 7) nss 3.28.4-12.el7_4, nss-tools 3.28.4-12.el7_4, nss-sysinit 3.28.4-12.el7_4 Red Hat Enterprise Linux Client Optional (v. 7) nss-devel 3.28.4-12.el7_4, nss-debuginfo 3.28.4-12.el7_4, nss-pkcs11-devel 3.28.4-12.el7_4 Red Hat Enterprise Linux ComputeNode (v. 7) nss 3.28.4-12.el7_4, nss-tools 3.28.4-12.el7_4, nss-sysinit 3.28.4-12.el7_4 Red Hat Enterprise Linux ComputeNode Optional (v. 7) nss-devel 3.28.4-12.el7_4, nss-debuginfo 3.28.4-12.el7_4, nss-pkcs11-devel 3.28.4-12.el7_4 Red Hat Enterprise Linux Desktop (v. 6) nss 3.28.4-4.el6_9, nss-tools 3.28.4-4.el6_9, nss-sysinit 3.28.4-4.el6_9 Red Hat Enterprise Linux Desktop Optional (v. 6) nss-devel 3.28.4-4.el6_9, nss-debuginfo 3.28.4-4.el6_9, nss-pkcs11-devel 3.28.4-4.el6_9
    +10 more products
    Red Hat Enterprise Linux HPC Node (v. 6) nss 3.28.4-4.el6_9, nss-tools 3.28.4-4.el6_9, nss-sysinit 3.28.4-4.el6_9 Red Hat Enterprise Linux HPC Node Optional (v. 6) nss-devel 3.28.4-4.el6_9, nss-debuginfo 3.28.4-4.el6_9, nss-pkcs11-devel 3.28.4-4.el6_9 Red Hat Enterprise Linux Server (v. 6) nss 3.28.4-4.el6_9, nss-tools 3.28.4-4.el6_9, nss-sysinit 3.28.4-4.el6_9 Red Hat Enterprise Linux Server (v. 7) nss 3.28.4-12.el7_4, nss-tools 3.28.4-12.el7_4, nss-sysinit 3.28.4-12.el7_4 Red Hat Enterprise Linux Server Optional (v. 6) nss-debuginfo 3.28.4-4.el6_9, nss-pkcs11-devel 3.28.4-4.el6_9 Red Hat Enterprise Linux Server Optional (v. 7) nss-debuginfo 3.28.4-12.el7_4, nss-pkcs11-devel 3.28.4-12.el7_4 Red Hat Enterprise Linux Workstation (v. 6) nss 3.28.4-4.el6_9, nss-tools 3.28.4-4.el6_9, nss-sysinit 3.28.4-4.el6_9 Red Hat Enterprise Linux Workstation (v. 7) nss 3.28.4-12.el7_4, nss-tools 3.28.4-12.el7_4, nss-sysinit 3.28.4-12.el7_4 Red Hat Enterprise Linux Workstation Optional (v. 6) nss-debuginfo 3.28.4-4.el6_9, nss-pkcs11-devel 3.28.4-4.el6_9 Red Hat Enterprise Linux Workstation Optional (v. 7) nss-debuginfo 3.28.4-12.el7_4, nss-pkcs11-devel 3.28.4-12.el7_4
    fixed: vendor fix RHSA-2017:2832

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.05% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

  • Mozilla Firefox
  • Mozilla Firefox ESR
  • Mozilla Thunderbird

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.