CVE-2021-29981
HIGH
8.8
CVSS Score
Published: August 17, 2021 at 07:12 PM UTC
Updated: June 17, 2026 at 03:48 AM UTC
2 products affected across 1 vendorFirefoxThunderbird
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Severity
HIGH8.8
Exploit prediction
EPSS 1%
Description
An issue present in lowering/register allocation could have led to obscure but deterministic register confusion failures in JITted code that would lead to a potentially exploitable crash. This vulnerability affects Firefox < 91 and Thunderbird < 91.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 91
Affected range stops below 91, so it looks safe — our inference, not a vendor statement
Affected range stops below 91.0, so it looks safe — our inference, not a vendor statement
v < 91
Affected range stops below 91, so it looks safe — our inference, not a vendor statement
Affected range stops below 91.0, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (4)
x_refsource_MISCIssue TrackingVendor Advisory
Source: [email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1707774Vendor Advisoryx_refsource_GENTOOThird Party Advisory
Source: [email protected]
https://security.gentoo.org/glsa/202202-03x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2021-33/x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2021-36/CVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- REQUIRED
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- HIGH
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
NVD-CWE-noinfo
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