THREATPORT/VULNERABILITY/CVE-2021-25832
CRITICAL SEVERITY

CVE-2021-25832

Document Server vulnerability

CVSS
9.8
EPSS
12.6%
EPSS pct
96th
Exploited
No known
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.
Affected vendor
Onlyoffice
Affected product
Document Server
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness type (CWE)
Published
2021-03-01

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 12.6% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 96% of all scored CVEs.

Check your external exposure to CVE-2021-25832

  • Confirm whether Onlyoffice Document Server is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2021-25832.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-25832

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-25832 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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