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NVD / CVE Program· CNA mozilla

CVE-2023-34416: Memory safety bugs present in Firefox 113, Firefox ESR 102.11, and Thunderbird 102.12.

CriticalCVSS 9.8 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 39/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.93% (FIRST EPSS); higher than 61% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: firefox (AlmaLinux:8) 102.12.0-1.el8_8.alma; thunderbird (AlmaLinux:8) 102.12.0-1.el8_8.alma; firefox (AlmaLinux:9) 102.12.0-1.el9_2.alma.
  • Mentioned 3 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to firefox (AlmaLinux:8) 102.12.0-1.el8_8.alma; thunderbird (AlmaLinux:8) 102.12.0-1.el8_8.alma; firefox (AlmaLinux:9) 102.12.0-1.el9_2.alma or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Memory safety bugs present in Firefox 113, Firefox ESR 102.11, and Thunderbird 102.12. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 102.12, Firefox < 114, and Thunderbird < 102.12.

Published
Jun 19, 2023
Updated
Oct 24, 2026
EPSS
0.9% · 61th percentile

Report tools

JSON

Action score

39

Monitor

Low priority for now.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.9%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
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  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
mozillafirefox
mozillafirefox esr
mozillathunderbird

Versions reported by the vendor

Affected version ranges reported by the assigning authority (mozilla). Independent of NVD's CPE analysis and usually ahead of it.

  • Mozilla Firefox

    • unspecified and later · before 114affected

  • Mozilla Firefox ESR

    • unspecified and later · before 102.12affected

  • Mozilla Thunderbird

    • unspecified and later · before 102.12affected

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • mozilla firefoxbefore 114.0
  • mozilla firefox esrbefore 102.12
  • mozilla thunderbirdbefore 102.12

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8firefoxbefore 102.12.0-1.el8_8.alma102.12.0-1.el8_8.alma
AlmaLinux:8thunderbirdbefore 102.12.0-1.el8_8.alma102.12.0-1.el8_8.alma
AlmaLinux:9firefoxbefore 102.12.0-1.el9_2.alma102.12.0-1.el9_2.alma
AlmaLinux:9firefox-x11before 102.12.0-1.el9_2.alma102.12.0-1.el9_2.alma
AlmaLinux:9thunderbirdbefore 102.12.0-1.el9_2.alma102.12.0-1.el9_2.alma
Alpine:v3.18firefox-esrbefore 102.12.0-r0102.12.0-r0
Debian:10firefox-esrbefore 102.12.0esr-1~deb10u1102.12.0esr-1~deb10u1
Debian:10thunderbirdbefore 1:102.12.0-1~deb10u11:102.12.0-1~deb10u1
Debian:11firefox-esrbefore 102.12.0esr-1~deb11u1102.12.0esr-1~deb11u1
Debian:11thunderbirdbefore 1:102.12.0-1~deb11u11:102.12.0-1~deb11u1
Debian:12firefox-esrbefore 102.12.0esr-1~deb12u1102.12.0esr-1~deb12u1
Debian:12thunderbirdbefore 1:102.12.0-1~deb12u11:102.12.0-1~deb12u1
Debian:13firefox-esrbefore 102.12.0esr-1102.12.0esr-1
Debian:13thunderbirdbefore 1:102.12.0-11:102.12.0-1
openSUSE:Leap 15.4MozillaFirefoxbefore 102.12.0-150200.152.90.1102.12.0-150200.152.90.1
openSUSE:Leap 15.4MozillaThunderbirdbefore 102.12.0-150200.8.121.1102.12.0-150200.8.121.1
openSUSE:TumbleweedMozillaFirefoxbefore 114.0.1-1.1114.0.1-1.1
openSUSE:TumbleweedMozillaThunderbirdbefore 102.12.0-1.1102.12.0-1.1
Red Hat:enterprise_linux:7::clientfirefoxbefore 0:102.12.0-1.el7_90:102.12.0-1.el7_9
Red Hat:enterprise_linux:7::clientfirefox-debuginfobefore 0:102.12.0-1.el7_90:102.12.0-1.el7_9
Red Hat:enterprise_linux:7::clientthunderbirdbefore 0:102.12.0-1.el7_90:102.12.0-1.el7_9
Red Hat:enterprise_linux:7::clientthunderbird-debuginfobefore 0:102.12.0-1.el7_90:102.12.0-1.el7_9
Red Hat:enterprise_linux:8::appstreamfirefoxbefore 0:102.12.0-1.el8_80:102.12.0-1.el8_8
Red Hat:enterprise_linux:8::appstreamfirefox-debuginfobefore 0:102.12.0-1.el8_80:102.12.0-1.el8_8

+48

Same product

mozilla: all records

Other highest-scoring records for the same primary product.

  • CVE-2010-3765Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before 3.1.6 and 3.0.x before 3.0.10, and SeaMonkey 2.x…KEV
    94Now
  • CVE-2019-11708Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can result in the…KEV
    87Now
  • CVE-2015-4495The PDF reader in Mozilla Firefox before 39.0.3, Firefox ESR 38.x before 38.1.1, and Firefox OS before 2.2 allows remote attackers to…KEV
    86Now

Published before and after this one in the same product

  • ← EarlierCVE-2023-29545Jun 19, 2023 · Similar to CVE-2023-28163, this time when choosing 'Save Link As', suggested filenames containing environment variable names would have…
    26Monitor
  • ← EarlierCVE-2023-34414Jun 19, 2023 · The error page for sites with invalid TLS certificates was missing the activation-delay Firefox uses to protect prompts and permission…
    12Monitor
  • Later →CVE-2023-37201Jul 5, 2023 · An attacker could have triggered a use-after-free condition when creating a WebRTC connection over HTTPS.
    35Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:firefox102.12.0-1.el9_2.alma · AlmaLinux:9Package registry (OSV)
almalinux:firefox-x11102.12.0-1.el9_2.alma · AlmaLinux:9Package registry (OSV)
almalinux:thunderbird102.12.0-1.el9_2.alma · AlmaLinux:9Package registry (OSV)
alpine:firefox-esr102.12.0-r0 · Alpine:v3.18Package registry (OSV)
debian:firefox-esr102.12.0esr-1~deb12u1 · Debian:12Package registry (OSV)
debian:thunderbird1:102.12.0-1~deb12u1 · Debian:12Package registry (OSV)
opensuse:MozillaFirefox102.12.0-150200.152.90.1 · openSUSE:Leap 15.4Package registry (OSV)
opensuse:MozillaThunderbird102.12.0-150200.8.121.1 · openSUSE:Leap 15.4Package registry (OSV)
red hat:firefox0:102.12.0-1.el8_6 · Red Hat:rhel_eus:8.6::appstreamPackage registry (OSV)
red hat:firefox-debuginfo0:102.12.0-1.el8_6 · Red Hat:rhel_eus:8.6::appstreamPackage registry (OSV)
red hat:firefox-debugsource0:102.12.0-1.el8_6 · Red Hat:rhel_eus:8.6::appstreamPackage registry (OSV)
red hat:firefox-x110:102.12.0-1.el9_2 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:thunderbird0:102.12.0-1.el7_9 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:thunderbird-debuginfo0:102.12.0-1.el7_9 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:thunderbird-debugsource0:102.12.0-1.el8_1 · Red Hat:rhel_e4s:8.1::appstreamPackage registry (OSV)
rocky linux:firefox0:102.12.0-1.el8_8 · Rocky Linux:8Package registry (OSV)
rocky linux:thunderbird0:102.12.0-1.el9_2 · Rocky Linux:9Package registry (OSV)
suse:MozillaFirefox102.12.0-150000.150.88.1 · SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSSPackage registry (OSV)
suse:MozillaFirefox102.12.0-150200.152.90.1 · SUSE:Linux Enterprise Module for Desktop Applications 15 SP4Package registry (OSV)
suse:MozillaThunderbird102.12.0-150200.8.121.1 · SUSE:Linux Enterprise Module for Package Hub 15 SP4Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Not on record for this CVE: EPSS history · patch commit or PR link · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records