Mozilla Firefox and Thunderbird Denial-of-Service Vulnerability

CheckOps priority index

8.0/10 Patch within 24 h

Severity8.8

Probability6.9

Exploitation4/5

Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.

EPSS · today 69.0% higher than 99.4% of CVEs

CVSS 3.1 8.8 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:

Exploited for 1,681 days 28 Mar 2022

CISA due date 18 Apr 2022 for US federal agencies

Exploitation probability EPSS · FIRST

EPSS probability (%)Percentile among all CVEs

Exploitation signals 4 / 5

KEV catalog (CISA)28 Mar 2022
Exploited in EUVD (ENISA)28 Mar 2022
Used by ransomwareno
EPSS above 10 %69.0%
No account, over the networkyes

What to do

Fix

Apply the vendor’s fix as soon as it is available.

CISA guidance: Apply updates per vendor instructions.

Meanwhile

Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.

Manufacturers (CRA)

Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained

Description ENISA EUVD

Mozilla Firefox before 22.0, Firefox ESR 17.x before 17.0.7, Thunderbird before 17.0.7, and Thunderbird ESR 17.x before 17.0.7 do not properly handle onreadystatechange events in conjunction with page reloading, which allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted web site that triggers an attempt to execute data at an unmapped memory location.

Affected products

Firefox and Thunderbird

Weaknesses (CWE)

CWE-119

Open source packages OSV

Affected libraries according to OSV, with fixed versions.

Timeline

26 Jun 2013
Published
28 Mar 2022
Exploitation reported (ENISA)
28 Mar 2022
Added to the KEV catalog
18 Apr 2022
CISA remediation due date
26 Sept 2026
EPSS peak: 69.0%

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CVE-2016-9079Mozilla Firefox, Firefox ESR, and Thunderbird Use-After-Free Vulnerability
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CVE-2015-4495Mozilla Firefox Security Feature Bypass Vulnerability
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CVE-2019-11708Mozilla Firefox and Thunderbird Sandbox Escape Vulnerability
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CVE-2019-11707Mozilla Firefox and Thunderbird Type Confusion Vulnerability
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