CVE-2020-26974
Mozilla Firefox and Thunderbird Flex Basis Heap Use-After-Free Vulnerability
Description
When flex-basis was used on a table wrapper, a StyleGenericFlexBasis object could have been incorrectly cast to the wrong type. This resulted in a heap user-after-free, memory corruption, and a potentially exploitable crash. This vulnerability affects Firefox < 84, Thunderbird < 78.6, and Firefox ESR < 78.6.
INFO
Published Date :
Jan. 7, 2021, 2:15 p.m.
Last Modified :
Nov. 21, 2024, 5:20 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2020-26974
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 2.0 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Upgrade Firefox to version 84.0 or later.
- Upgrade Firefox ESR to version 78.6 or later.
- Upgrade Thunderbird to version 78.6 or later.
- Update affected packages as per vendor guidance.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2020-26974.
| URL | Resource |
|---|---|
| https://bugzilla.mozilla.org/show_bug.cgi?id=1681022 | Permissions Required |
| https://www.mozilla.org/security/advisories/mfsa2020-54/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2020-55/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2020-56/ | Vendor Advisory |
| https://bugzilla.mozilla.org/show_bug.cgi?id=1681022 | Permissions Required |
| https://www.mozilla.org/security/advisories/mfsa2020-54/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2020-55/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2020-56/ | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2020-26974 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2020-26974
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2020-26974 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2020-26974 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://bugzilla.mozilla.org/show_bug.cgi?id=1681022 Added Reference https://www.mozilla.org/security/advisories/mfsa2020-54/ Added Reference https://www.mozilla.org/security/advisories/mfsa2020-55/ Added Reference https://www.mozilla.org/security/advisories/mfsa2020-56/ -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Jan. 12, 2021
Action Type Old Value New Value Added CVSS V2 Metadata Victim must voluntarily interact with attack mechanism Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:P/I:P/A:P) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Changed Reference Type https://bugzilla.mozilla.org/show_bug.cgi?id=1681022 No Types Assigned https://bugzilla.mozilla.org/show_bug.cgi?id=1681022 Permissions Required Changed Reference Type https://www.mozilla.org/security/advisories/mfsa2020-54/ No Types Assigned https://www.mozilla.org/security/advisories/mfsa2020-54/ Vendor Advisory Changed Reference Type https://www.mozilla.org/security/advisories/mfsa2020-55/ No Types Assigned https://www.mozilla.org/security/advisories/mfsa2020-55/ Vendor Advisory Changed Reference Type https://www.mozilla.org/security/advisories/mfsa2020-56/ No Types Assigned https://www.mozilla.org/security/advisories/mfsa2020-56/ Vendor Advisory Added CWE NIST CWE-787 Added CPE Configuration OR *cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* versions up to (excluding) 84.0 *cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* versions up to (excluding) 78.6.0 *cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* versions up to (excluding) 78.6.0
Vulnerability Scoring Details
Base CVSS Score: 8.8
Base CVSS Score: 6.8
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.54 }} 0.25%
score
0.66416
percentile