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Fencer Vulns
medium 6.5

CVE-2023-25752 json

When accessing throttled streams, the count of available bytes needed to be checked in the calling function to be within bounds.

published 2023-06-02 3 y ago modified 2026-10-24 15 d ago also EUVD-2023-29659

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits
0
none known

Summary

When accessing throttled streams, the count of available bytes needed to be checked in the calling function to be within bounds. This may have lead future code to be incorrect and vulnerable. This vulnerability affects Firefox < 111, Firefox ESR < 102.9, and Thunderbird < 102.9.

Patch / fix

  • Mozilla Firefox 111
  • Mozilla Firefox ESR 102.9
  • Mozilla Thunderbird 102.9
  • firefox-esr Debian 14, Debian 13, Debian 12 102.9.0esr-1
  • thunderbird Debian 14, Debian 13, Debian 12 1:102.9.0-1

debian advisories DEBIAN-CVE-2023-25752

  • firefox Ubuntu 18.04 LTS 111.0+build2-0ubuntu0.18.04.1
  • firefox Ubuntu 20.04 LTS 111.0+build2-0ubuntu0.20.04.1
  • thunderbird Ubuntu 18.04 LTS 1:102.9.0+build1-0ubuntu0.18.04.1
  • thunderbird Ubuntu 20.04 LTS 1:102.9.0+build1-0ubuntu0.20.04.1
  • thunderbird Ubuntu 22.04 LTS 1:102.9.0+build1-0ubuntu0.22.04.1

ubuntu advisories UBUNTU-CVE-2023-25752

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

  • thunderbird RHEL 7 102.9.0-1.el7_9
  • thunderbird RHEL 8 102.9.0-1.el8_7
  • thunderbird RHEL 9 102.9.0-1.el9_1
  • firefox RHEL 8 102.9.0-3.el8_7
  • firefox RHEL 7 102.9.0-3.el7_9
  • firefox RHEL 9 102.9.0-3.el9_1
  • firefox-x11 RHEL 9 102.9.0-3.el9_1
  • thunderbird RHEL 9.0 EUS 102.9.0-1.el9_0

red hat advisories RHSA-2023:1401RHSA-2023:1402RHSA-2023:1403RHSA-2023:1404RHSA-2023:1479RHSA-2023:1407

  • MozillaThunderbird SLE Workstation Extension 15 SP4, SLE Module for Package Hub 15 SP4, openSUSE Leap 15.4 102.9.1-150200.8.110.2
  • MozillaFirefox SLES for SAP 15 SP3, SLES for SAP 15 SP2, SLES 15 SP3-LTSS +9 more 102.9.0-150200.152.81.1
  • MozillaFirefox SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +6 more 102.9.0-112.153.1
  • MozillaFirefox SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLE High Performance Computing 15 SP1-LTSS 102.9.0-150000.150.79.1

suse advisories SUSE-SU-2023:1736-1SUSE-SU-2023:0835-1SUSE-SU-2023:0763-1SUSE-SU-2023:0728-1

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaThunderbird openSUSE Tumbleweed 102.9.0-1.1
  • MozillaFirefox openSUSE Tumbleweed 111.0.1-1.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:12791-1openSUSE-SU-2024:12839-1

  • thunderbird AlmaLinux 8 102.9.0-1.el8_7.alma
  • thunderbird AlmaLinux 9 102.9.0-1.el9_1.alma
  • firefox AlmaLinux 8 102.9.0-3.el8_7.alma
  • firefox AlmaLinux 9 102.9.0-3.el9_1.alma
  • firefox-x11 AlmaLinux 9 102.9.0-3.el9_1.alma

almalinux advisories ALSA-2023:1403ALSA-2023:1407ALSA-2023:1336ALSA-2023:1337

  • firefox Rocky Linux 9 102.9.0-3.el9_1
  • thunderbird Rocky Linux 9 102.9.0-1.el9_1
  • firefox Rocky Linux 8 102.9.0-3.el8_7
  • thunderbird Rocky Linux 8 102.9.0-1.el8_7

rocky linux advisories RLSA-2023:1337RLSA-2023:1407RLSA-2023:1336RLSA-2023:1403

  • firefox-esr Alpine 3.23, Alpine 3.22, Alpine 3.21 +3 more 102.9.0-r0

alpine advisories ALPINE-CVE-2023-25752

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-2023-25752 updated cvss 6.1

Mozilla: Potential out-of-bounds when accessing throttled streams

  • Red Hat Enterprise Linux 6 firefox, thunderbird
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) firefox 102.9.0-3.el8_7, thunderbird 102.9.0-1.el8_7
    fixed: vendor fix RHSA-2023:1336
  • Red Hat Enterprise Linux AppStream (v. 9) firefox 102.9.0-3.el9_1, firefox-x11 102.9.0-3.el9_1, thunderbird 102.9.0-1.el9_1
    fixed: vendor fix RHSA-2023:1337
  • Red Hat Enterprise Linux AppStream AUS (v. 8.2) firefox 102.9.0-4.el8_2, thunderbird 102.9.0-2.el8_2
    fixed: vendor fix RHSA-2023:1445
  • Red Hat Enterprise Linux AppStream E4S (v. 8.1) firefox 102.9.0-4.el8_1, thunderbird 102.9.0-2.el8_1
    fixed: vendor fix RHSA-2023:1479
  • Red Hat Enterprise Linux AppStream E4S (v. 8.2) firefox 102.9.0-4.el8_2, thunderbird 102.9.0-2.el8_2
    fixed: vendor fix RHSA-2023:1445
  • Red Hat Enterprise Linux AppStream EUS (v.8.4) firefox 102.9.0-4.el8_4, thunderbird 102.9.0-2.el8_4
    fixed: vendor fix RHSA-2023:1444
  • Red Hat Enterprise Linux AppStream EUS (v.8.6) firefox 102.9.0-3.el8_6, thunderbird 102.9.0-1.el8_6
    fixed: vendor fix RHSA-2023:1367
show 3 more
  • Red Hat Enterprise Linux AppStream EUS (v.9.0) firefox 102.9.0-3.el9_0, thunderbird 102.9.0-1.el9_0
    fixed: vendor fix RHSA-2023:1364
  • Red Hat Enterprise Linux AppStream TUS (v. 8.2) firefox 102.9.0-4.el8_2, thunderbird 102.9.0-2.el8_2
    fixed: vendor fix RHSA-2023:1445
  • Red Hat Enterprise Linux Client (v. 7) firefox 102.9.0-3.el7_9, thunderbird 102.9.0-1.el7_9 Red Hat Enterprise Linux Client Optional (v. 7) firefox 102.9.0-3.el7_9 Red Hat Enterprise Linux Server (v. 7) firefox 102.9.0-3.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) firefox 102.9.0-3.el7_9, thunderbird 102.9.0-1.el7_9 Red Hat Enterprise Linux Workstation (v. 7) firefox 102.9.0-3.el7_9, thunderbird 102.9.0-1.el7_9 Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 102.9.0-3.el7_9
    fixed: vendor fix RHSA-2023:1333

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
21 mo ago

Exploit prediction

0.61% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Affected products

  • Mozilla Firefox
  • Mozilla Firefox ESR
  • Mozilla Thunderbird

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.