Exploited vulnerability · CISA KEV

Is CVE-2021-26084 exploited? Yes: in CISA KEV since 3 Nov 2021

Gociux · Atlassian Confluence Server and Data Center · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2021-26084, Atlassian Confluence Server and Data Center Object-Graph Navigation Language (OGNL) Injection Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 65 days after it was published. It is known to be used in ransomware campaigns. It affects Atlassian Confluence Server and Data Center. If you run it, CISA's required action is: Apply updates per vendor instructions.

What it is

Atlassian Confluence Server and Data Server contain an Object-Graph Navigation Language (OGNL) injection vulnerability that may allow an unauthenticated attacker to execute code.

What to do

1. Check whether you run it. Look for Confluence Server and Data Center in your asset inventory, including appliances and cloud images. Stack check lists every exploited Atlassian CVE at once.
2. Apply the fix. Apply updates per vendor instructions.
3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 30 Aug 2021.
4. Get told next time. Email alerts when CISA adds a CVE for Atlassian.

Other exploited CVEs in Confluence Server and Data Center

• CVE-2019-3398: Atlassian Confluence Server and Data Center Path Traversal Vulnerability (3 Nov 2021)

References

• nvd.nist.gov/vuln/detail/CVE-2021-26084

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in November 2021 · Atlassian scorecard · act-now radar.