HOMEVULNERABILITIESCVE-2021-23827
MEDIUM

CVE-2021-23827

CWE-312Published: February 23, 2021· Updated: Jun 17, 2026

5.5
CVSS v3.1

Official Description

Keybase Desktop Client before 5.6.0 on Windows and macOS, and before 5.6.1 on Linux, allows an attacker to obtain potentially sensitive media (such as private pictures) in the Cache and uploadtemps directories. It fails to effectively clear cached pictures, even after deletion via normal methodology within the client, or by utilizing the "Explode message/Explode now" functionality. Local filesystem access is needed by the attacker.

NVD Source

Technical Analysis

CVE-2021-23827 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 5.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected Vendors & Products

Apple1 product(s)
macos
keybase1 product(s)
keybase
Microsoft1 product(s)
windows
Red Hat1 product(s)
linux
Source: NVD CPE · 4 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://github.com/keybase/client/releases
ADVISORYhttps://hackerone.com/reports/1074930
ADVISORYhttps://johnjhacking.com/blog/cve-2021-23827/
ADVISORYhttps://github.com/keybase/client/releases
ADVISORYhttps://hackerone.com/reports/1074930
ADVISORYhttps://johnjhacking.com/blog/cve-2021-23827/

All References (6)

→
https://github.com/keybase/client/releasesRelease Notes · Third Party Advisory
→
https://hackerone.com/reports/1074930Exploit · Issue Tracking · Third Party Advisory
→
https://johnjhacking.com/blog/cve-2021-23827/Exploit · Third Party Advisory
→
https://github.com/keybase/client/releasesRelease Notes · Third Party Advisory
→
https://hackerone.com/reports/1074930Exploit · Issue Tracking · Third Party Advisory
→
https://johnjhacking.com/blog/cve-2021-23827/Exploit · Third Party Advisory

Quick Facts

CVE IDCVE-2021-23827
CVSS Score5.5 / 10
SeverityMEDIUM
WeaknessCWE-312
CISA KEVNo
Affected4 vendor(s)
PublishedFeb 23, 2021

Related CVEs (CWE-312)

CVE-2021-36782
9.9
CVE-2019-19228
9.8
CVE-2020-5723
9.8
CVE-2019-18868
9.8
CVE-2021-29954
9.8
CVE-2020-15332
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-23827 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.COM. CVE data is provided under the NVD usage policy.
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