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Vulnerability details: VCID-477z-z5bh-auf4
Vulnerability ID VCID-477z-z5bh-auf4
Aliases CVE-2023-6856
Summary The WebGL DrawElementsInstanced method was susceptible to a heap buffer overflow when used on systems with the Mesa VM driver. This issue could allow an attacker to perform remote code execution and sandbox escape.
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-2023-6856.json
epss 0.08516 https://api.first.org/data/v1/epss?cve=CVE-2023-6856
epss 0.08516 https://api.first.org/data/v1/epss?cve=CVE-2023-6856
epss 0.08516 https://api.first.org/data/v1/epss?cve=CVE-2023-6856
epss 0.08516 https://api.first.org/data/v1/epss?cve=CVE-2023-6856
epss 0.08516 https://api.first.org/data/v1/epss?cve=CVE-2023-6856
epss 0.08516 https://api.first.org/data/v1/epss?cve=CVE-2023-6856
epss 0.08516 https://api.first.org/data/v1/epss?cve=CVE-2023-6856
epss 0.08516 https://api.first.org/data/v1/epss?cve=CVE-2023-6856
epss 0.08516 https://api.first.org/data/v1/epss?cve=CVE-2023-6856
epss 0.08516 https://api.first.org/data/v1/epss?cve=CVE-2023-6856
epss 0.08516 https://api.first.org/data/v1/epss?cve=CVE-2023-6856
epss 0.08516 https://api.first.org/data/v1/epss?cve=CVE-2023-6856
epss 0.08516 https://api.first.org/data/v1/epss?cve=CVE-2023-6856
epss 0.08516 https://api.first.org/data/v1/epss?cve=CVE-2023-6856
cvssv3.1 8.8 https://nvd.nist.gov/vuln/detail/CVE-2023-6856
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
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-6856.json
https://api.first.org/data/v1/epss?cve=CVE-2023-6856
https://bugzilla.mozilla.org/show_bug.cgi?id=1843782
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
2255360 https://bugzilla.redhat.com/show_bug.cgi?id=2255360
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-2023-6856 https://nvd.nist.gov/vuln/detail/CVE-2023-6856
mfsa2023-54 https://www.mozilla.org/en-US/security/advisories/mfsa2023-54
mfsa2023-55 https://www.mozilla.org/en-US/security/advisories/mfsa2023-55
mfsa2023-56 https://www.mozilla.org/en-US/security/advisories/mfsa2023-56
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
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-2023-6856.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: 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-2023-6856
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
Exploit Prediction Scoring System (EPSS)
Percentile 0.91987
EPSS Score 0.08516
Published At Aug. 8, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:32.590076+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2023/mfsa2023-54.yml 37.0.0