CVE-2021-26084 KEV EXPLOIT
9.8
CRITICAL · CVSS 3.1 · EPSS 100% (pctl 100)
Patch first
On CISA KEV — known exploited in the wild, due 2021-11-17.
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.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 100% — more likely to be exploited than 100% of all CVEs |
| Weakness | CWE-917 |
| On CISA KEV | yes — remediate by 2021-11-17 |
| Public exploit | yes |
| Published | 2021-08-30 |
| Last modified | 2026-06-17 |
CISA KEV
| Name | Atlassian Confluence Server and Data Center Object-Graph Navigation Language (OGNL) Injection Vulnerability |
|---|---|
| Added | 2021-11-03 |
| Due | 2021-11-17 |
| Vendor / product | Atlassian / Confluence Server and Data Center |
| Ransomware use | known |
Affected (2)
| Vendor | Product |
|---|---|
| atlassian | confluence data center |
| atlassian | confluence server |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | Confluence Server 7.12.4 - 'OGNL injection' Remote Code Execution (RCE) (Unauthenticated) | 2021-09-01 |
References
- http://packetstormsecurity.com/files/167449/Atlassian-Confluence-Namespace-OGNL-Injection.html
- https://jira.atlassian.com/browse/CONFSERVER-67940
- http://packetstormsecurity.com/files/167449/Atlassian-Confluence-Namespace-OGNL-Injection.html
- https://jira.atlassian.com/browse/CONFSERVER-67940
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26084
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