Vulnerability in Onlyoffice Document Server
CVE-2021-25829
An improper binary stream data handling issue was found in the [core] module of ONLYOFFICE DocumentServer v4.0.0-9-v5.6.3. Using this bug, an attacker is able to produce a denial of service attack that can eventually shut down the target server.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.074 (94.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 94th percentile — 94.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.074 · newest: 0.074 · change: 0.000
Affected products
Public proof-of-concept exploits
References
- github.com/ONLYOFFICE/DocumentServer (Product)
- github.com/ONLYOFFICE/core (Product, Vendor Advisory)
- github.com/ONLYOFFICE/core/blob/v5.6.4.10/ASCOfficePPTXFile/Editor/BinaryFileRe… (Vendor Advisory)
- github.com/ONLYOFFICE/core/blob/c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a/ASCOff… (Vendor Advisory)
- github.com/ONLYOFFICE/core/blob/c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a/ASCOff… (Vendor Advisory)
- github.com/ONLYOFFICE/core/blob/c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a/ASCOff… (Vendor Advisory)
- github.com/ONLYOFFICE/core/blob/c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a/ASCOff… (Vendor Advisory)
- github.com/ONLYOFFICE/core/blob/c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a/ASCOff… (Vendor Advisory)
- github.com/ONLYOFFICE/core/blob/c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a/ASCOff… (Vendor Advisory)
- github.com/merrychap/poc_exploits/tree/master/ONLYOFFICE/CVE-2021-25829 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-25829?
- CVE-2021-25829 is a high-severity vulnerability in Onlyoffice Document Server. CVSS score: 7.5/10. Published 2021-03-01.
- How severe is CVE-2021-25829?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2021-25829 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.