HOMEVULNERABILITIESCVE-2021-43445
CRITICAL

CVE-2021-43445

CWE-287Published: January 23, 2023· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

ONLYOFFICE all versions as of 2021-11-08 is affected by Incorrect Access Control. An attacker can authenticate with the web socket service of the ONLYOFFICE document editor which is protected by JWT auth by using a default JWT signing key.

NVD Source

Technical Analysis

CVE-2021-43445 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.

From a weakness classification perspective (CWE-287): Authentication bypass vulnerabilities allow attackers to access protected resources without valid credentials.

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

onlyoffice1 product(s)
server
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://github.com/ONLYOFFICE/server
ADVISORYhttps://labs.nettitude.com/blog/exploiting-onlyoffice-web-sockets-for-unauthenticated-remote-code-execution/
ADVISORYhttps://www.onlyoffice.com/
ADVISORYhttps://github.com/ONLYOFFICE/server
ADVISORYhttps://labs.nettitude.com/blog/exploiting-onlyoffice-web-sockets-for-unauthenticated-remote-code-execution/
ADVISORYhttps://www.onlyoffice.com/

All References (6)

→
https://github.com/ONLYOFFICE/serverThird Party Advisory
→
https://labs.nettitude.com/blog/exploiting-onlyoffice-web-sockets-for-unauthenticated-remote-code-execution/Mitigation · Third Party Advisory
→
https://www.onlyoffice.com/Product · Vendor Advisory
→
https://github.com/ONLYOFFICE/serverThird Party Advisory
→
https://labs.nettitude.com/blog/exploiting-onlyoffice-web-sockets-for-unauthenticated-remote-code-execution/Mitigation · Third Party Advisory
→
https://www.onlyoffice.com/Product · Vendor Advisory

Quick Facts

CVE IDCVE-2021-43445
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-287
CISA KEVNo
Affected1 vendor(s)
PublishedJan 23, 2023

Related CVEs (CWE-287)

CVE-2015-2033
10.0
CVE-2015-0198
10.0
CVE-2014-2955
10.0
CVE-2014-8329
10.0
CVE-2015-0653
10.0
CVE-2015-5998
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-43445 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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