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Vulnerability details: VCID-rgx1-1g16-5kfz
Vulnerability ID VCID-rgx1-1g16-5kfz
Aliases CVE-2023-6858
Summary Firefox was susceptible to a heap buffer overflow in nsTextFragment due to insufficient OOM handling.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-122 Heap-based Buffer Overflow
CWE-787 Out-of-bounds Write
System Score Found at
cvssv3 8.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-6858.json
epss 0.00381 https://api.first.org/data/v1/epss?cve=CVE-2023-6858
epss 0.00381 https://api.first.org/data/v1/epss?cve=CVE-2023-6858
epss 0.00381 https://api.first.org/data/v1/epss?cve=CVE-2023-6858
epss 0.00381 https://api.first.org/data/v1/epss?cve=CVE-2023-6858
epss 0.00381 https://api.first.org/data/v1/epss?cve=CVE-2023-6858
epss 0.00381 https://api.first.org/data/v1/epss?cve=CVE-2023-6858
epss 0.00381 https://api.first.org/data/v1/epss?cve=CVE-2023-6858
epss 0.00381 https://api.first.org/data/v1/epss?cve=CVE-2023-6858
epss 0.00381 https://api.first.org/data/v1/epss?cve=CVE-2023-6858
epss 0.00381 https://api.first.org/data/v1/epss?cve=CVE-2023-6858
epss 0.00381 https://api.first.org/data/v1/epss?cve=CVE-2023-6858
epss 0.00381 https://api.first.org/data/v1/epss?cve=CVE-2023-6858
epss 0.00381 https://api.first.org/data/v1/epss?cve=CVE-2023-6858
epss 0.00381 https://api.first.org/data/v1/epss?cve=CVE-2023-6858
epss 0.00381 https://api.first.org/data/v1/epss?cve=CVE-2023-6858
epss 0.00381 https://api.first.org/data/v1/epss?cve=CVE-2023-6858
epss 0.00381 https://api.first.org/data/v1/epss?cve=CVE-2023-6858
cvssv3.1 8.8 https://bugzilla.mozilla.org/show_bug.cgi?id=1826791
ssvc Track https://bugzilla.mozilla.org/show_bug.cgi?id=1826791
cvssv3.1 8.8 https://lists.debian.org/debian-lts-announce/2023/12/msg00020.html
ssvc Track https://lists.debian.org/debian-lts-announce/2023/12/msg00020.html
cvssv3.1 8.8 https://lists.debian.org/debian-lts-announce/2023/12/msg00021.html
ssvc Track https://lists.debian.org/debian-lts-announce/2023/12/msg00021.html
cvssv3.1 8.8 https://nvd.nist.gov/vuln/detail/CVE-2023-6858
cvssv3.1 8.8 https://security.gentoo.org/glsa/202401-10
ssvc Track https://security.gentoo.org/glsa/202401-10
cvssv3.1 8.8 https://www.debian.org/security/2023/dsa-5581
ssvc Track https://www.debian.org/security/2023/dsa-5581
cvssv3.1 8.8 https://www.debian.org/security/2023/dsa-5582
ssvc Track https://www.debian.org/security/2023/dsa-5582
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2023-54
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2023-55
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2023-56
cvssv3.1 8.8 https://www.mozilla.org/security/advisories/mfsa2023-54/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2023-54/
cvssv3.1 8.8 https://www.mozilla.org/security/advisories/mfsa2023-55/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2023-55/
cvssv3.1 8.8 https://www.mozilla.org/security/advisories/mfsa2023-56/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2023-56/
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-6858.json
https://api.first.org/data/v1/epss?cve=CVE-2023-6858
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-50761
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-50762
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6856
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6857
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6858
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6859
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6860
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6861
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6862
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6863
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6864
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6865
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6867
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6873
https://security.gentoo.org/glsa/202401-10
2255363 https://bugzilla.redhat.com/show_bug.cgi?id=2255363
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:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
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-2023-6858 https://nvd.nist.gov/vuln/detail/CVE-2023-6858
dsa-5581 https://www.debian.org/security/2023/dsa-5581
dsa-5582 https://www.debian.org/security/2023/dsa-5582
mfsa2023-54 https://www.mozilla.org/en-US/security/advisories/mfsa2023-54
mfsa2023-54 https://www.mozilla.org/security/advisories/mfsa2023-54/
mfsa2023-55 https://www.mozilla.org/en-US/security/advisories/mfsa2023-55
mfsa2023-55 https://www.mozilla.org/security/advisories/mfsa2023-55/
mfsa2023-56 https://www.mozilla.org/en-US/security/advisories/mfsa2023-56
mfsa2023-56 https://www.mozilla.org/security/advisories/mfsa2023-56/
msg00020.html https://lists.debian.org/debian-lts-announce/2023/12/msg00020.html
msg00021.html https://lists.debian.org/debian-lts-announce/2023/12/msg00021.html
RHSA-2024:0001 https://access.redhat.com/errata/RHSA-2024:0001
RHSA-2024:0002 https://access.redhat.com/errata/RHSA-2024:0002
RHSA-2024:0003 https://access.redhat.com/errata/RHSA-2024:0003
RHSA-2024:0004 https://access.redhat.com/errata/RHSA-2024:0004
RHSA-2024:0005 https://access.redhat.com/errata/RHSA-2024:0005
RHSA-2024:0011 https://access.redhat.com/errata/RHSA-2024:0011
RHSA-2024:0012 https://access.redhat.com/errata/RHSA-2024:0012
RHSA-2024:0019 https://access.redhat.com/errata/RHSA-2024:0019
RHSA-2024:0021 https://access.redhat.com/errata/RHSA-2024:0021
RHSA-2024:0022 https://access.redhat.com/errata/RHSA-2024:0022
RHSA-2024:0023 https://access.redhat.com/errata/RHSA-2024:0023
RHSA-2024:0024 https://access.redhat.com/errata/RHSA-2024:0024
RHSA-2024:0025 https://access.redhat.com/errata/RHSA-2024:0025
RHSA-2024:0026 https://access.redhat.com/errata/RHSA-2024:0026
RHSA-2024:0027 https://access.redhat.com/errata/RHSA-2024:0027
RHSA-2024:0028 https://access.redhat.com/errata/RHSA-2024:0028
RHSA-2024:0029 https://access.redhat.com/errata/RHSA-2024:0029
RHSA-2024:0030 https://access.redhat.com/errata/RHSA-2024:0030
show_bug.cgi?id=1826791 https://bugzilla.mozilla.org/show_bug.cgi?id=1826791
USN-6562-1 https://usn.ubuntu.com/6562-1/
USN-6563-1 https://usn.ubuntu.com/6563-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-6858.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

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://bugzilla.mozilla.org/show_bug.cgi?id=1826791
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

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Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2025-05-07T20:24:54Z/ Found at https://bugzilla.mozilla.org/show_bug.cgi?id=1826791
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://lists.debian.org/debian-lts-announce/2023/12/msg00020.html
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

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Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2025-05-07T20:24:54Z/ Found at https://lists.debian.org/debian-lts-announce/2023/12/msg00020.html
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://lists.debian.org/debian-lts-announce/2023/12/msg00021.html
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

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none

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unchanged

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Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2025-05-07T20:24:54Z/ Found at https://lists.debian.org/debian-lts-announce/2023/12/msg00021.html
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2023-6858
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

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://security.gentoo.org/glsa/202401-10
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

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none

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unchanged

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Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2025-05-07T20:24:54Z/ Found at https://security.gentoo.org/glsa/202401-10
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://www.debian.org/security/2023/dsa-5581
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

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required

unchanged

changed

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Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2025-05-07T20:24:54Z/ Found at https://www.debian.org/security/2023/dsa-5581
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://www.debian.org/security/2023/dsa-5582
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

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required

unchanged

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Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2025-05-07T20:24:54Z/ Found at https://www.debian.org/security/2023/dsa-5582
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://www.mozilla.org/security/advisories/mfsa2023-54/
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

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none

required

unchanged

changed

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none

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Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2025-05-07T20:24:54Z/ Found at https://www.mozilla.org/security/advisories/mfsa2023-54/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://www.mozilla.org/security/advisories/mfsa2023-55/
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

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required

unchanged

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none

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Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2025-05-07T20:24:54Z/ Found at https://www.mozilla.org/security/advisories/mfsa2023-55/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://www.mozilla.org/security/advisories/mfsa2023-56/
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

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none

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Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2025-05-07T20:24:54Z/ Found at https://www.mozilla.org/security/advisories/mfsa2023-56/
Exploit Prediction Scoring System (EPSS)
Percentile 0.58715
EPSS Score 0.00381
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:32.656227+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2023/mfsa2023-54.yml 37.0.0