Buffer overflow in Onlyoffice Document Server
CVE-2021-25832
A heap buffer overflow vulnerability inside of BMP image processing was found at [core] module of ONLYOFFICE DocumentServer v4.0.0-9-v6.0.0. Using this vulnerability, an attacker is able to gain remote code executions on DocumentServer.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.126 (96.1th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 96.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.126 · newest: 0.126 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/ONLYOFFICE/DocumentServer (Product)
- github.com/ONLYOFFICE/core (Product, Vendor Advisory)
- github.com/ONLYOFFICE/core/blob/v6.0.1.15/DesktopEditor/cximage/CxImage/ximabmp… (Vendor Advisory)
- github.com/ONLYOFFICE/core/blob/v6.0.1.15/DesktopEditor/cximage/CxImage/ximabmp… (Vendor Advisory)
- github.com/ONLYOFFICE/core/blob/v6.0.1.15/ASCOfficePPTXFile/Editor/BinaryFileRe… (Vendor Advisory)
- github.com/ONLYOFFICE/core/blob/v6.0.1.15/ASCOfficePPTXFile/Editor/BinaryFileRe… (Vendor Advisory)
- github.com/merrychap/poc_exploits/tree/master/ONLYOFFICE/CVE-2021-25832 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-25832?
- CVE-2021-25832 is a critical-severity vulnerability in Onlyoffice Document Server, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2021-03-01.
- How severe is CVE-2021-25832?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-25832 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.