CVE-2020-6824Public exploit

Password reuse via uncleared private-session cache

Published Apr 24, 2020 · Updated Aug 4, 2024

Password-generation flaw in Mozilla Firefox before 75 allows local users to recover reused private-session passwords from memory. LoginManagerParent caches generated passwords by origin but does not clear its map when the last private-browsing context exits, so a later private session receives the same value. The browser must remain open, the same site must be revisited, and password generation must be used; the retained password and origin are then exposed to local memory access or privileged browser code.

CVSS severity2.8
Low
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Password-generation flaw in Mozilla Firefox before 75 allows local users to recover reused private-session passwords from memory. LoginManagerParent caches generated passwords by origin but does not clear its map when the last private-browsing context exits, so a later private session receives the same value. The browser must remain open, the same site must be revisited, and password generation must be used; the retained password and origin are then exposed to local memory access or privileged browser code.

The record

CVE
CVE-2020-6824
Published
Apr 24, 2020
Updated
Aug 4, 2024
Vendor
Mozilla
Product
Firefox
Classifications
CWE-384
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 24, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <75

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <75

Published CVSS scores

1.9NIST National Vulnerability DatabaseAV:L/AC:M/Au:N/C:P/I:N/A:N
2.8Ubuntu SecurityCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-384Session Fixation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo