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Fencer Vulns
medium 6.5

CVE-2023-5388 json

NSS was susceptible to a timing side-channel attack when performing RSA decryption.

published 2024-03-19 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-57703

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 62%
public exploits
0
none known

Summary

NSS was susceptible to a timing side-channel attack when performing RSA decryption. This attack could potentially allow an attacker to recover the private data. This vulnerability affects Firefox < 124, Firefox ESR < 115.9, and Thunderbird < 115.9.

Patch / fix

  • Mozilla Firefox 124
  • Mozilla Firefox ESR 115.9
  • Mozilla Thunderbird 115.9
  • nss Debian 14, Debian 13 2:3.98-1
  • firefox-esr Debian 12 115.9.0esr-1~deb12u1
  • firefox-esr Debian 14, Debian 13 115.9.0esr-1
  • thunderbird Debian 12 1:115.9.0-1~deb12u1
  • thunderbird Debian 14, Debian 13 1:115.9.0-1

debian advisories DEBIAN-CVE-2023-5388

  • nss Ubuntu 20.04 LTS 2:3.98-0ubuntu0.20.04.1
  • nss Ubuntu 22.04 LTS 2:3.98-0ubuntu0.22.04.1
  • firefox Ubuntu 20.04 LTS 124.0+build1-0ubuntu0.20.04.1
  • thunderbird Ubuntu 20.04 LTS 1:115.9.0+build1-0ubuntu0.20.04.1
  • thunderbird Ubuntu 22.04 LTS 1:115.9.0+build1-0ubuntu0.22.04.1

ubuntu advisories UBUNTU-CVE-2023-5388

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

  • firefox RHEL 7 115.9.1-1.el7_9
  • firefox RHEL 9 115.9.1-1.el9_3
  • firefox-x11 RHEL 9 115.9.1-1.el9_3
  • thunderbird RHEL 7 115.9.0-1.el7_9
  • thunderbird RHEL 9 115.9.0-1.el9_3
  • firefox RHEL 8 115.9.1-1.el8_9
  • thunderbird RHEL 8 115.9.0-1.el8_9
  • nss RHEL 8 3.90.0-4.el8_9

red hat advisories RHSA-2024:1489RHSA-2024:1490RHSA-2024:1491RHSA-2024:1499RHSA-2024:1488RHSA-2024:1500

  • mozilla-nss Linux Micro 6.0 3.101.2-1.1
  • mozilla-nss SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Module for Basesystem 15 SP6 +11 more 3.101.2-150400.3.48.1
  • mozilla-nss SLES for SAP 15 SP3, SLES for SAP 15 SP2, SLES 15 SP3-LTSS +6 more 3.101.1-150000.3.117.1
  • mozilla-nss SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 3.101.1-58.118.1
  • MozillaThunderbird SLE Workstation Extension 15 SP5, SLE Module for Package Hub 15 SP5, openSUSE Leap 15.5 115.9.0-150200.8.154.1
  • MozillaFirefox SLES for SAP 15 SP4, SLES for SAP 15 SP3, SLES for SAP 15 SP2 +10 more 115.9.1-150200.152.131.1
  • MozillaFirefox SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 115.9.0-112.203.2
  • mozilla-nss SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Module for Basesystem 15 SP5 +10 more 3.90.2-150400.3.39.1

suse advisories SUSE-SU-2025:20030-1SUSE-RU-2024:2684-1SUSE-SU-2024:2600-1SUSE-RU-2024:2564-1SUSE-SU-2024:1147-1SUSE-SU-2024:1002-1

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaThunderbird openSUSE Tumbleweed 115.9.0-1.1
  • mozilla-nss openSUSE Tumbleweed 3.98-1.1
  • MozillaFirefox openSUSE Tumbleweed 124.0.1-1.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:13789-1openSUSE-SU-2024:13793-1openSUSE-SU-2024:13795-1

  • firefox AlmaLinux 8 115.9.1-1.el8_9.alma.1
  • firefox AlmaLinux 9 115.9.1-1.el9_3.alma.1
  • firefox-x11 AlmaLinux 9 115.9.1-1.el9_3.alma.1
  • thunderbird AlmaLinux 9 115.9.0-1.el9_3.alma.1
  • thunderbird AlmaLinux 8 115.9.0-1.el8_9.alma.1
  • nss AlmaLinux 8 3.90.0-4.el8_9
  • nss-util AlmaLinux 8 3.90.0-4.el8_9
  • nss-tools AlmaLinux 8 3.90.0-4.el8_9

almalinux advisories ALSA-2024:1484ALSA-2024:1485ALSA-2024:1493ALSA-2024:1494ALSA-2024:0105ALSA-2024:0108

  • firefox Rocky Linux 8 115.9.1-1.el8_9
  • thunderbird Rocky Linux 8 115.9.0-1.el8_9
  • nss Rocky Linux 8 3.90.0-4.el8_9

rocky linux advisories RLSA-2024:1484RLSA-2024:1494RLSA-2024:0105

  • nss Alpine 3.24, Alpine 3.23, Alpine 3.22 +3 more 3.98-r0
  • firefox-esr Alpine 3.19, Alpine 3.18 115.9.0-r0

alpine advisories ALPINE-CVE-2023-5388

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2023-5388 updated cvss 6.5

nss: timing attack against RSA decryption

  • Red Hat Enterprise Linux 6 nss, firefox, nss-tools, nss-sysinit, thunderbird Red Hat Enterprise Linux 7 nss, nss-tools, nss-sysinit
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) nss 3.90.0-4.el8_9, firefox 115.9.1-1.el8_9, nss-util 3.90.0-4.el8_9, nss-tools 3.90.0-4.el8_9, nss-softokn 3.90.0-4.el8_9, nss-sysinit 3.90.0-4.el8_9, +2 more
    fixed: vendor fix RHSA-2024:1484
  • Red Hat Enterprise Linux AppStream (v. 9) nss 3.90.0-4.el9_3, nspr 4.35.0-4.el9_3, firefox 115.9.1-1.el9_3, nss-util 3.90.0-4.el9_3, nss-tools 3.90.0-4.el9_3, nss-softokn 3.90.0-4.el9_3, +4 more
    fixed: vendor fix RHSA-2024:1485
  • Red Hat Enterprise Linux AppStream AUS (v. 8.2) firefox 115.9.1-1.el8_2, thunderbird 115.9.0-1.el8_2
    fixed: vendor fix RHSA-2024:1490
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) firefox 115.9.1-1.el8_4, thunderbird 115.9.0-1.el8_4
    fixed: vendor fix RHSA-2024:1491
  • Red Hat Enterprise Linux AppStream E4S (v. 8.2) firefox 115.9.1-1.el8_2, thunderbird 115.9.0-1.el8_2
    fixed: vendor fix RHSA-2024:1490
  • Red Hat Enterprise Linux AppStream E4S (v.8.4) firefox 115.9.1-1.el8_4, thunderbird 115.9.0-1.el8_4
    fixed: vendor fix RHSA-2024:1491
  • Red Hat Enterprise Linux AppStream EUS (v.8.6) nss 3.79.0-12.el8_6, firefox 115.9.1-1.el8_6, nss-util 3.79.0-12.el8_6, nss-tools 3.79.0-12.el8_6, nss-softokn 3.79.0-12.el8_6, nss-sysinit 3.79.0-12.el8_6, +2 more
    fixed: vendor fix RHSA-2024:1489
show 6 more
  • Red Hat Enterprise Linux AppStream EUS (v.8.8) nss 3.90.0-4.el8_8, firefox 115.9.1-1.el8_8, nss-util 3.90.0-4.el8_8, nss-tools 3.90.0-4.el8_8, nss-softokn 3.90.0-4.el8_8, nss-sysinit 3.90.0-4.el8_8, +2 more
    fixed: vendor fix RHSA-2024:1488
  • Red Hat Enterprise Linux AppStream EUS (v.9.0) firefox 115.9.1-1.el9_0, thunderbird 115.9.0-1.el9_0
    fixed: vendor fix RHSA-2024:1487
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) nss 3.90.0-4.el9_2, nspr 4.35.0-4.el9_2, firefox 115.9.1-1.el9_2, nss-util 3.90.0-4.el9_2, nss-tools 3.90.0-4.el9_2, nss-softokn 3.90.0-4.el9_2, +4 more
    fixed: vendor fix RHSA-2024:1483
  • Red Hat Enterprise Linux AppStream TUS (v. 8.2) firefox 115.9.1-1.el8_2, thunderbird 115.9.0-1.el8_2
    fixed: vendor fix RHSA-2024:1490
  • Red Hat Enterprise Linux AppStream TUS (v.8.4) firefox 115.9.1-1.el8_4, thunderbird 115.9.0-1.el8_4
    fixed: vendor fix RHSA-2024:1491
  • Red Hat Enterprise Linux Client (v. 7) firefox 115.9.1-1.el7_9, thunderbird 115.9.0-1.el7_9 Red Hat Enterprise Linux Client Optional (v. 7) firefox 115.9.1-1.el7_9 Red Hat Enterprise Linux Server (v. 7) firefox 115.9.1-1.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) firefox 115.9.1-1.el7_9, thunderbird 115.9.0-1.el7_9 Red Hat Enterprise Linux Workstation (v. 7) firefox 115.9.1-1.el7_9, thunderbird 115.9.0-1.el7_9 Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 115.9.1-1.el7_9
    fixed: vendor fix RHSA-2024:1486

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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.97% chance of exploitation in the next 30 days, higher than 62% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.