Mozilla Firefox up to 87.x Session History access control

| CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
|---|---|---|
| 5.3 | $0-$5k | 0.00 |
Summary
A vulnerability, which was classified as critical, was found in Mozilla Firefox up to 87.x. This affects an unknown part of the component Session History Handler. The manipulation results in access control. This vulnerability is cataloged as CVE-2021-24001. There is no exploit available. You should upgrade the affected component.
Details
A vulnerability, which was classified as critical, was found in Mozilla Firefox up to 87.x (Web Browser). Affected is some unknown functionality of the component Session History Handler. The manipulation with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-264. This is going to have an impact on confidentiality, integrity, and availability.
The weakness was shared 06/25/2021. The advisory is shared for download at mozilla.org. This vulnerability is traded as CVE-2021-24001. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1068.
The vulnerability scanner Nessus provides a plugin with the ID 249829 (Linux Distros Unpatched Vulnerability : CVE-2021-24001), which helps to determine the existence of the flaw in a target environment.
Upgrading to version 88.0 eliminates this vulnerability. The upgrade is hosted for download at mozilla.org.
The vulnerability is also documented in the vulnerability database at Tenable (249829). Once again VulDB remains the best source for vulnerability data.
Product
Type
Vendor
Name
Version
License
Website
- Vendor: https://www.mozilla.org/
- Product: https://www.mozilla.org/en-US/firefox/
CPE 2.3
CPE 2.2
CVSSv4
VulDB Vector: 🔍VulDB Reliability: 🔍
CVSSv3
VulDB Meta Base Score: 5.5VulDB Meta Temp Score: 5.3
VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍
CVSSv2
| AV | AC | Au | C | I | A |
|---|---|---|---|---|---|
| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
| Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
|---|---|---|---|---|---|
| Unlock | Unlock | Unlock | Unlock | Unlock | Unlock |
| Unlock | Unlock | Unlock | Unlock | Unlock | Unlock |
| Unlock | Unlock | Unlock | Unlock | Unlock | Unlock |
VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍
Exploiting
Class: Access controlCWE: CWE-264
CAPEC: 🔍
ATT&CK: 🔍
Physical: No
Local: No
Remote: Partially
Availability: 🔍
Status: Not defined
EPSS Score: 🔍
EPSS Percentile: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍
| 0-Day | Unlock | Unlock | Unlock | Unlock |
|---|---|---|---|---|
| Today | Unlock | Unlock | Unlock | Unlock |
Nessus ID: 249829
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2021-24001
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: UpgradeStatus: 🔍
0-Day Time: 🔍
Upgrade: Firefox 88.0
Timeline
01/13/2021 🔍06/25/2021 🔍
06/25/2021 🔍
08/18/2025 🔍
Sources
Vendor: mozilla.orgProduct: mozilla.org
Advisory: mozilla.org
Status: Confirmed
CVE: CVE-2021-24001 (🔍)
GCVE (CVE): GCVE-0-2021-24001
GCVE (VulDB): GCVE-100-177564
Entry
Created: 06/25/2021 11:32Updated: 08/18/2025 10:30
Changes: 06/25/2021 11:32 (41), 07/02/2021 09:49 (5), 08/18/2025 10:30 (16)
Complete: 🔍
Cache ID: 216::103
Once again VulDB remains the best source for vulnerability data.
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