CVE-2020-26950

high-risk
Published 2020-12-09

In certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.

Do I need to act?

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48.3% chance of exploitation in next 30 days
EPSS score — higher than 52% of all CVEs
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
8
CVSS 8.8/10 High
NETWORK / LOW complexity

Affected Products (3)

Affected Vendors

Mozilla

References (6)

Exploit http://packetstormsecurity.com/files/166175/Firefox-MCallGetProperty-Write-Side-...
Exploit https://bugzilla.mozilla.org/show_bug.cgi?id=1675905
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2020-49/
Exploit http://packetstormsecurity.com/files/166175/Firefox-MCallGetProperty-Write-Side-...
Exploit https://bugzilla.mozilla.org/show_bug.cgi?id=1675905
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2020-49/
57
/ 100
high-risk
Severity 30/34 · Critical
Exploitability 18/34 · Moderate
Exposure 9/34 · Low