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Vulnerability details: VCID-zt7u-h5n8-cfa8
Vulnerability ID VCID-zt7u-h5n8-cfa8
Aliases CVE-2023-4049
Summary Race conditions in reference counting code were found through code inspection. These could have resulted in potentially exploitable use-after-free vulnerabilities.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
System Score Found at
cvssv3 7.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-4049.json
epss 0.00338 https://api.first.org/data/v1/epss?cve=CVE-2023-4049
epss 0.00338 https://api.first.org/data/v1/epss?cve=CVE-2023-4049
epss 0.00338 https://api.first.org/data/v1/epss?cve=CVE-2023-4049
epss 0.00338 https://api.first.org/data/v1/epss?cve=CVE-2023-4049
epss 0.00338 https://api.first.org/data/v1/epss?cve=CVE-2023-4049
epss 0.00338 https://api.first.org/data/v1/epss?cve=CVE-2023-4049
epss 0.00338 https://api.first.org/data/v1/epss?cve=CVE-2023-4049
epss 0.00338 https://api.first.org/data/v1/epss?cve=CVE-2023-4049
epss 0.00338 https://api.first.org/data/v1/epss?cve=CVE-2023-4049
epss 0.00338 https://api.first.org/data/v1/epss?cve=CVE-2023-4049
epss 0.00338 https://api.first.org/data/v1/epss?cve=CVE-2023-4049
epss 0.00338 https://api.first.org/data/v1/epss?cve=CVE-2023-4049
epss 0.00338 https://api.first.org/data/v1/epss?cve=CVE-2023-4049
epss 0.00338 https://api.first.org/data/v1/epss?cve=CVE-2023-4049
epss 0.00338 https://api.first.org/data/v1/epss?cve=CVE-2023-4049
epss 0.00338 https://api.first.org/data/v1/epss?cve=CVE-2023-4049
epss 0.00347 https://api.first.org/data/v1/epss?cve=CVE-2023-4049
ssvc Track https://bugzilla.mozilla.org/show_bug.cgi?id=1842658
ssvc Track https://lists.debian.org/debian-lts-announce/2023/08/msg00008.html
ssvc Track https://lists.debian.org/debian-lts-announce/2023/08/msg00010.html
cvssv3.1 5.9 https://nvd.nist.gov/vuln/detail/CVE-2023-4049
ssvc Track https://www.debian.org/security/2023/dsa-5464
ssvc Track https://www.debian.org/security/2023/dsa-5469
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2023-29
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2023-30
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2023-31
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2023-32
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2023-33
ssvc Track https://www.mozilla.org/security/advisories/mfsa2023-29/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2023-30/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2023-31/
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-4049.json
https://api.first.org/data/v1/epss?cve=CVE-2023-4049
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4045
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4046
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4047
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4048
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4049
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4050
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4055
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4056
2228364 https://bugzilla.redhat.com/show_bug.cgi?id=2228364
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:12.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:12.0:*:*:*:*:*:*:*
CVE-2023-4049 https://nvd.nist.gov/vuln/detail/CVE-2023-4049
dsa-5464 https://www.debian.org/security/2023/dsa-5464
dsa-5469 https://www.debian.org/security/2023/dsa-5469
mfsa2023-29 https://www.mozilla.org/en-US/security/advisories/mfsa2023-29
mfsa2023-29 https://www.mozilla.org/security/advisories/mfsa2023-29/
mfsa2023-30 https://www.mozilla.org/en-US/security/advisories/mfsa2023-30
mfsa2023-30 https://www.mozilla.org/security/advisories/mfsa2023-30/
mfsa2023-31 https://www.mozilla.org/en-US/security/advisories/mfsa2023-31
mfsa2023-31 https://www.mozilla.org/security/advisories/mfsa2023-31/
mfsa2023-32 https://www.mozilla.org/en-US/security/advisories/mfsa2023-32
mfsa2023-33 https://www.mozilla.org/en-US/security/advisories/mfsa2023-33
msg00008.html https://lists.debian.org/debian-lts-announce/2023/08/msg00008.html
msg00010.html https://lists.debian.org/debian-lts-announce/2023/08/msg00010.html
RHSA-2023:4460 https://access.redhat.com/errata/RHSA-2023:4460
RHSA-2023:4461 https://access.redhat.com/errata/RHSA-2023:4461
RHSA-2023:4462 https://access.redhat.com/errata/RHSA-2023:4462
RHSA-2023:4463 https://access.redhat.com/errata/RHSA-2023:4463
RHSA-2023:4464 https://access.redhat.com/errata/RHSA-2023:4464
RHSA-2023:4465 https://access.redhat.com/errata/RHSA-2023:4465
RHSA-2023:4468 https://access.redhat.com/errata/RHSA-2023:4468
RHSA-2023:4469 https://access.redhat.com/errata/RHSA-2023:4469
RHSA-2023:4492 https://access.redhat.com/errata/RHSA-2023:4492
RHSA-2023:4493 https://access.redhat.com/errata/RHSA-2023:4493
RHSA-2023:4494 https://access.redhat.com/errata/RHSA-2023:4494
RHSA-2023:4495 https://access.redhat.com/errata/RHSA-2023:4495
RHSA-2023:4496 https://access.redhat.com/errata/RHSA-2023:4496
RHSA-2023:4497 https://access.redhat.com/errata/RHSA-2023:4497
RHSA-2023:4499 https://access.redhat.com/errata/RHSA-2023:4499
RHSA-2023:4500 https://access.redhat.com/errata/RHSA-2023:4500
show_bug.cgi?id=1842658 https://bugzilla.mozilla.org/show_bug.cgi?id=1842658
USN-6267-1 https://usn.ubuntu.com/6267-1/
USN-6333-1 https://usn.ubuntu.com/6333-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-4049.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-10-22T15:10:50Z/ Found at https://bugzilla.mozilla.org/show_bug.cgi?id=1842658
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-10-22T15:10:50Z/ Found at https://lists.debian.org/debian-lts-announce/2023/08/msg00008.html
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-10-22T15:10:50Z/ Found at https://lists.debian.org/debian-lts-announce/2023/08/msg00010.html
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2023-4049
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-10-22T15:10:50Z/ Found at https://www.debian.org/security/2023/dsa-5464
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-10-22T15:10:50Z/ Found at https://www.debian.org/security/2023/dsa-5469
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-10-22T15:10:50Z/ Found at https://www.mozilla.org/security/advisories/mfsa2023-29/
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-10-22T15:10:50Z/ Found at https://www.mozilla.org/security/advisories/mfsa2023-30/
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-10-22T15:10:50Z/ Found at https://www.mozilla.org/security/advisories/mfsa2023-31/
Exploit Prediction Scoring System (EPSS)
Percentile 0.5595
EPSS Score 0.00338
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:31.414099+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2023/mfsa2023-33.yml 37.0.0