CVE & CISA-KEV Catalog

CVE-2021-23985

MEDIUM
6.5
CVSS v3
NVD

Description

If an attacker is able to alter specific about:config values (for example malware running on the user's computer), the Devtools remote debugging feature could have been enabled in a way that was unnoticable to the user. This would have allowed a remote attacker (able to make a direct network connection to the victim) to monitor the user's browsing activity and (plaintext) network traffic. This was addressed by providing a visual cue when Devtools has an open network socket. This vulnerability affects Firefox < 87.

How to fix

Remediation Available
firefoxDebian
Fixed in:87.0-1CVE-2021-23985
firefoxUbuntu
Fixed in:87.0+build3-0ubuntu0.16.04.2USN-4893-1
Fixed in:87.0+build3-0ubuntu0.18.04.2USN-4893-1
Fixed in:87.0+build3-0ubuntu0.20.04.2USN-4893-1
DeveloperEditionWindows application
Affected:87.0Fixed in:87.0Mozilla
Mozilla Firefox (en-US)Windows application
Affected:87.0Fixed in:87.0Mozilla

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionRequired
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityNone
AvailabilityNone

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

Exploit Intelligence

1.40%probability of exploitation in 30 days
69thpercentile

Moderate risk: more likely to be exploited than 69% of all known CVEs.

References

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Markdown

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HTML

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.