CVE-2021-43448 json
ONLYOFFICE all versions as of 2021-11-08 is vulnerable to Improper Input Validation.
published 2023-01-23 3 y ago modified 2026-06-17 4 mo ago also EUVD-2021-30381
- cvss
- 5.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 63%
- public exploits
- 0
- none known
Summary
ONLYOFFICE all versions as of 2021-11-08 is vulnerable to Improper Input Validation. A lack of input validation can allow an attacker to spoof the names of users who interact with a document, if the document id is known.
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 19 mo ago
Exploit prediction
1.03% chance of exploitation in the next 30 days, higher than 63% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- labs.nettitude.com https://labs.nettitude.com/blog/exploiting-onlyoffice-web-sockets-for-unauthenticated-remote-code-execution/ referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N |
| NVD | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N |
| CNA | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N |
Classification
- Weakness
-
- CWE-20 Improper Input Validation
References
-
labs.nettitude.com
/blog/exploiting-onlyoffice-web-sockets-for-unauthenticated-remote-code-execution/
exploit, mitigation, third-party-advisory
-
onlyoffice.com
/
product, vendor-advisory
-
github.com
/ONLYOFFICE/server
third-party-advisory
Sources
- CVE List CVE-2021-43448
- NVD CVE-2021-43448
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