HOMEVULNERABILITIESCVE-2020-6823
CRITICAL

CVE-2020-6823

CWE-862Published: April 24, 2020· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

A malicious extension could have called <code>browser.identity.launchWebAuthFlow</code>, controlling the redirect_uri, and through the Promise returned, obtain the Auth code and gain access to the user's account at the service provider. This vulnerability affects Firefox < 75.

NVD Source

Technical Analysis

CVE-2020-6823 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

Mozilla1 product(s)
firefox
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://bugzilla.mozilla.org/show_bug.cgi?id=1614919
ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2020-12/
ADVISORYhttps://bugzilla.mozilla.org/show_bug.cgi?id=1614919
ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2020-12/

All References (4)

→
https://bugzilla.mozilla.org/show_bug.cgi?id=1614919Issue Tracking · Vendor Advisory
→
https://www.mozilla.org/security/advisories/mfsa2020-12/Third Party Advisory
→
https://bugzilla.mozilla.org/show_bug.cgi?id=1614919Issue Tracking · Vendor Advisory
→
https://www.mozilla.org/security/advisories/mfsa2020-12/Third Party Advisory

Quick Facts

CVE IDCVE-2020-6823
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-862
CISA KEVNo
Affected1 vendor(s)
PublishedApr 24, 2020

Related CVEs (CWE-862)

CVE-2026-33712
10.0
CVE-2024-6071
10.0
CVE-2026-58275
10.0
CVE-2025-30416
10.0
CVE-2026-0092
10.0
CVE-2026-34976
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-6823 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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