CVE-2021-25829

moderate-risk
Published 2021-03-01

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.

Do I need to act?

~
3.8% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.5/10 High
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

Onlyoffice

References (20)

Product https://github.com/ONLYOFFICE/DocumentServer
Product https://github.com/ONLYOFFICE/core
Vendor Advisory https://github.com/ONLYOFFICE/core/blob/c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a...
Vendor Advisory https://github.com/ONLYOFFICE/core/blob/c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a...
Vendor Advisory https://github.com/ONLYOFFICE/core/blob/c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a...
Vendor Advisory https://github.com/ONLYOFFICE/core/blob/c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a...
Vendor Advisory https://github.com/ONLYOFFICE/core/blob/c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a...
Vendor Advisory https://github.com/ONLYOFFICE/core/blob/c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a...
Vendor Advisory https://github.com/ONLYOFFICE/core/blob/v5.6.4.10/ASCOfficePPTXFile/Editor/Binar...
Exploit https://github.com/merrychap/poc_exploits/tree/master/ONLYOFFICE/CVE-2021-25829
Product https://github.com/ONLYOFFICE/DocumentServer
Product https://github.com/ONLYOFFICE/core
Vendor Advisory https://github.com/ONLYOFFICE/core/blob/c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a...
Vendor Advisory https://github.com/ONLYOFFICE/core/blob/c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a...
Vendor Advisory https://github.com/ONLYOFFICE/core/blob/c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a...
Vendor Advisory https://github.com/ONLYOFFICE/core/blob/c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a...
Vendor Advisory https://github.com/ONLYOFFICE/core/blob/c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a...
Vendor Advisory https://github.com/ONLYOFFICE/core/blob/c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a...
Vendor Advisory https://github.com/ONLYOFFICE/core/blob/v5.6.4.10/ASCOfficePPTXFile/Editor/Binar...
Exploit https://github.com/merrychap/poc_exploits/tree/master/ONLYOFFICE/CVE-2021-25829
38
/ 100
moderate-risk
Severity 26/34 · High
Exploitability 7/34 · Low
Exposure 5/34 · Minimal