If a compromised content process sent an unexpected number of WebAuthN Extensions in a Register command to the parent process, an out of bou
Noroxi assessment
Priority: Monitor (action score 36/100)
- Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
- Probability of exploitation in the next 30 days: 2.5% (FIRST EPSS); higher than 84.9% of all records.
- Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
- Fixed version: firefox (AlmaLinux:8) 91.8.0-1.el8_5.alma; thunderbird (AlmaLinux:8) 91.8.0-1.el8_5.alma, 91.8.0-1.el8_5.alma.plus; firefox-esr (Debian:10) 91.8.0esr-1~deb10u1.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to firefox (AlmaLinux:8) 91.8.0-1.el8_5.alma; thunderbird (AlmaLinux:8) 91.8.0-1.el8_5.alma, 91.8.0-1.el8_5.alma.plus; firefox-esr (Debian:10) 91.8.0esr-1~deb10u1 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
If a compromised content process sent an unexpected number of WebAuthN Extensions in a Register command to the parent process, an out of bounds write would have occurred leading to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 91.8, Firefox < 99, and Firefox ESR < 91.8.
- BDU:2022-02369
- ALSA-2022:1287
- ALSA-2022:1301
- DLA-2971-1
- DLA-2978-1
- DSA-5113-1
- DSA-5118-1
- openSUSE-SU-2022:1127-1
- openSUSE-SU-2024:11975-1
- RHSA-2022:1283
- RHSA-2022:1284
- RHSA-2022:1285
- RHSA-2022:1286
- RHSA-2022:1287
- RHSA-2022:1301
- RHSA-2022:1302
- RHSA-2022:1303
- RHSA-2022:1305
- RHSA-2022:1326
- RLSA-2022:1287
- Published
- Dec 22, 2022
- Updated
- Jun 17, 2026
- EPSS
- 2.5% · 84th percentile
- CWE
- CWE-787
Report tools
Action score
36
Monitor
Low priority for now.
- CVSS
- 35 / 40 · 8.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 2.5%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- Proof of concept exists, no weaponized module
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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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.
We use this product, ask for helpAffected 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.
| Vendor | Product | CPE |
|---|---|---|
| mozilla | firefox | cpe:2.3:a:mozilla:firefox |
| mozilla | firefox esr | cpe:2.3:a:mozilla:firefox_esr |
| mozilla | thunderbird | cpe:2.3:a:mozilla:thunderbird |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- mozilla firefoxbefore 99.0
- mozilla firefox esrbefore 91.8
- mozilla thunderbirdbefore 91.8
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 99affected
Mozilla Firefox ESR
- unspecified and later · before 91.8affected
Mozilla Thunderbird
- unspecified and later · before 91.8affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:8 | firefox | before 91.8.0-1.el8_5.alma | 91.8.0-1.el8_5.alma |
| AlmaLinux:8 | thunderbird | before 91.8.0-1.el8_5.alma | 91.8.0-1.el8_5.alma |
| AlmaLinux:8 | thunderbird | before 91.8.0-1.el8_5.alma.plus | 91.8.0-1.el8_5.alma.plus |
| Debian:10 | firefox-esr | before 91.8.0esr-1~deb10u1 | 91.8.0esr-1~deb10u1 |
| Debian:10 | thunderbird | before 1:91.8.0-1~deb10u1 | 1:91.8.0-1~deb10u1 |
| Debian:11 | firefox-esr | before 91.8.0esr-1~deb11u1 | 91.8.0esr-1~deb11u1 |
| Debian:11 | thunderbird | before 1:91.8.0-1~deb11u1 | 1:91.8.0-1~deb11u1 |
| Debian:12 | firefox-esr | before 91.8.0esr-1 | 91.8.0esr-1 |
| Debian:12 | thunderbird | before 1:91.8.0-1 | 1:91.8.0-1 |
| Debian:9 | firefox-esr | before 91.8.0esr-1~deb9u1 | 91.8.0esr-1~deb9u1 |
| Debian:9 | thunderbird | before 1:91.8.0-1~deb9u1 | 1:91.8.0-1~deb9u1 |
| openSUSE:Leap 15.3 | MozillaFirefox | before 91.8.0-150200.152.26.1 | 91.8.0-150200.152.26.1 |
| openSUSE:Tumbleweed | MozillaFirefox | before 99.0-1.1 | 99.0-1.1 |
| Red Hat:enterprise_linux:7::client | firefox | before 0:91.8.0-1.el7_9 | 0:91.8.0-1.el7_9 |
| Red Hat:enterprise_linux:7::client | firefox-debuginfo | before 0:91.8.0-1.el7_9 | 0:91.8.0-1.el7_9 |
| Red Hat:enterprise_linux:7::client | thunderbird | before 0:91.8.0-1.el7_9 | 0:91.8.0-1.el7_9 |
| Red Hat:enterprise_linux:7::client | thunderbird-debuginfo | before 0:91.8.0-1.el7_9 | 0:91.8.0-1.el7_9 |
| Red Hat:enterprise_linux:8::appstream | firefox | before 0:91.8.0-1.el8_5 | 0:91.8.0-1.el8_5 |
| Red Hat:enterprise_linux:8::appstream | firefox-debuginfo | before 0:91.8.0-1.el8_5 | 0:91.8.0-1.el8_5 |
| Red Hat:enterprise_linux:8::appstream | firefox-debugsource | before 0:91.8.0-1.el8_5 | 0:91.8.0-1.el8_5 |
| Red Hat:enterprise_linux:8::appstream | thunderbird | before 0:91.8.0-1.el8_5 | 0:91.8.0-1.el8_5 |
| Red Hat:enterprise_linux:8::appstream | thunderbird-debuginfo | before 0:91.8.0-1.el8_5 | 0:91.8.0-1.el8_5 |
| Red Hat:enterprise_linux:8::appstream | thunderbird-debugsource | before 0:91.8.0-1.el8_5 | 0:91.8.0-1.el8_5 |
| Red Hat:rhel_e4s:8.1::appstream | firefox | before 0:91.8.0-1.el8_1 | 0:91.8.0-1.el8_1 |
+25
Same product
mozilla: all recordsOther 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 befKEV94Now
- CVE-2019-11708Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can result in the non-sandboxeKEV87Now
- 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 bypassKEV86Now
Published before and after this one in the same product
- ← EarlierCVE-2022-26485Dec 22, 2022 · Removing an XSLT parameter during processing could have lead to an exploitable use-after-free.KEV69This week
- ← EarlierCVE-2022-26486Dec 22, 2022 · An unexpected message in the WebGPU IPC framework could lead to a use-after-free and exploitable sandbox escape.KEV69This week
- Later →CVE-2022-28282Dec 22, 2022 · By using a link with <code>rel="localization"</code> a use-after-free could have been triggered by destroying an object during JavaScript ex27Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| almalinux:firefox | 91.8.0-1.el8_5.alma · AlmaLinux:8 | Package registry (OSV) |
| almalinux:thunderbird | 91.8.0-1.el8_5.alma · AlmaLinux:8 | Package registry (OSV) |
| debian:firefox-esr | 91.8.0esr-1 · Debian:12 | Package registry (OSV) |
| debian:thunderbird | 1:91.8.0-1 · Debian:12 | Package registry (OSV) |
| opensuse:MozillaFirefox | 91.8.0-150200.152.26.1 · openSUSE:Leap 15.3 | Package registry (OSV) |
| opensuse:MozillaThunderbird | 91.8.0-150200.8.65.1 · openSUSE:Leap 15.3 | Package registry (OSV) |
| red hat:firefox | 0:91.8.0-1.el8_1 · Red Hat:rhel_e4s:8.1::appstream | Package registry (OSV) |
| red hat:firefox-debuginfo | 0:91.8.0-1.el8_1 · Red Hat:rhel_e4s:8.1::appstream | Package registry (OSV) |
| red hat:firefox-debugsource | 0:91.8.0-1.el8_1 · Red Hat:rhel_e4s:8.1::appstream | Package registry (OSV) |
| red hat:thunderbird | 0:91.8.0-1.el8_5 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:thunderbird-debuginfo | 0:91.8.0-1.el8_5 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:thunderbird-debugsource | 0:91.8.0-1.el8_5 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| rocky linux:firefox | 0:91.8.0-1.el8_5 · Rocky Linux:8 | Package registry (OSV) |
| rocky linux:thunderbird | 0:91.8.0-1.el8_5 · Rocky Linux:8 | Package registry (OSV) |
| suse:MozillaFirefox | 91.8.0-112.98.1 · SUSE:HPE Helion OpenStack 8 | Package registry (OSV) |
| suse:MozillaThunderbird | 91.8.0-150200.8.65.1 · SUSE:Linux Enterprise Module for Package Hub 15 SP3 | Package registry (OSV) |
Exploit status
Proof of concept available
A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.
Evidence
- Proof-of-concept repository on GitHub ×1
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Proof-of-concept repository on GitHub | stars:73 | 2022-04-08 |
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.
- First PoC-259 d
- Published
- TodayOct 22, 2026+1400 d
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-22-0304 · Apr 11, 2022(RedHat Güvenlik Güncellemesi)
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- A user must open a link or visit a page.
- 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
- Required
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-787 · Out-of-bounds WriteCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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.
Change log
- Fix✗ → ✓
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