Actively exploited · Published Aug 30, 2021 · Assigned by atlassian
CVE-2021-26084
Critical 9.8 Exploited Ransomware
In plain English
A critical-severity expression language injection in Confluence Data Center from Atlassian. Attackers are actively exploiting it in the wild (listed by CISA on November 3, 2021). It has been used in ransomware campaigns. The chance it is exploited in the next 30 days is estimated at 100.0% (higher than 99.9% of all known vulnerabilities). Ready-made attack tooling exists: Metasploit, Nuclei, public proof-of-concept code. Apply updates per vendor instructions.
CISA guidance
Apply updates per vendor instructions.
Federal agencies must remediate by Nov 17, 2021.
Official description
In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists that would allow an unauthenticated attacker to execute arbitrary code on a Confluence Server or Data Center instance. The affected versions are before version 6.13.23, from version 6.14.0 before 7.4.11, from version 7.5.0 before 7.11.6, and from version 7.12.0 before 7.12.5.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Atlassian | Confluence Server | unspecified – before 6.13.236.14.0 – before unspecifiedunspecified – before 7.4.117.5.0 – before unspecifiedunspecified – before 7.11.67.12.0 – before unspecifiedunspecified – before 7.12.5 |
| Atlassian | Confluence Data Center | unspecified – before 6.13.236.14.0 – before unspecifiedunspecified – before 7.4.117.5.0 – before unspecifiedunspecified – before 7.11.67.12.0 – before unspecifiedunspecified – before 7.12.5 |
Weakness: CWE-917 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H