Security readout for executives and security teams
Plain-English summary
CVE-2021-24001 is a Firefox browser issue where a compromised content process could manipulate session history in ways it should not. The source bundle says this happened because testing infrastructure was not limited to testing-only configurations. Firefox versions before 88 are affected.
Executive priority
Treat as a browser hygiene issue unless legacy Firefox below 88 remains in use. No active exploitation evidence is provided, but outdated browsers increase endpoint risk.
Technical view
The vulnerability concerns Firefox session history controls exposed beyond intended testing-only use. Mozilla describes a scenario requiring an already compromised content process, which could then perform unauthorized session history manipulation. The bundle identifies Firefox versions earlier than 88 as affected.
Likely exposure
Exposure is limited to environments running Mozilla Firefox earlier than version 88. The bundle does not identify other Mozilla products or downstream packages.
Exploitation context
The source bundle does not show CISA KEV listing, public exploitation, exploit availability, or observed attacks. The described condition requires a compromised content process before the session history abuse becomes relevant.
Researcher notes
Evidence is sparse: no CVSS, CWE, exploit details, or remediation notes beyond the affected version boundary. Analysis should stay anchored to Mozilla’s advisory and CVE record until more vendor detail is reviewed.
Mitigation direction
- Upgrade Firefox to version 88 or later.
- Confirm managed browser update policies cover all user endpoints.
- Check Mozilla advisory MFSA2021-16 for vendor guidance.
- Prioritize replacement of unsupported legacy Firefox installations.
Validation and detection
- Inventory Firefox versions across desktops, VDI, and managed images.
- Flag any Firefox installation below version 88.
- Review endpoint management logs for successful browser update deployment.
- Document any exceptions that cannot be upgraded immediately.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-24001 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://www.mozilla.org/security/advisories/mfsa2021-16/CVE reference · x_refsource_MISC
- https://bugzilla.mozilla.org/show_bug.cgi?id=1694727CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.