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Exploited vulnerability · CISA KEV

Is CVE-2021-26086 exploited? Yes: in CISA KEV since 12 Nov 2024

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

Yes. CVE-2021-26086, Atlassian Jira Server and Data Center Path Traversal Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 12 Nov 2024, 1184 days after it was published. It affects Atlassian Jira Server and Data Center. If you run it, CISA's required action is: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 12 Nov 2024
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity5.3CVSS 3.1 · medium
US federal due3 Dec 2024BOD 22-01 deadline

What it is

Atlassian Jira Server and Data Center contain a path traversal vulnerability that allows a remote attacker to read particular files in the /WEB-INF/web.xml endpoint.

VendorAtlassian (14 exploited CVEs in KEV)
ProductJira Server and Data Center
VulnerabilityAtlassian Jira Server and Data Center Path Traversal Vulnerability
WeaknessCWE-22
Published16 Aug 2021
Added to KEV12 Nov 2024
Reported by (CNA)atlassian

What to do

  1. Check whether you run it. Look for Jira 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 mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
  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 16 Aug 2021.
  4. Get told next time. Email alerts when CISA adds a CVE for Atlassian.

Other exploited CVEs in Jira Server and Data Center

References

Questions

Is CVE-2021-26086 being exploited?

Yes. CISA added CVE-2021-26086 to the Known Exploited Vulnerabilities catalog on 12 Nov 2024, which means there is reliable evidence of exploitation in the wild.

Is CVE-2021-26086 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2021-26086?

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. Check Atlassian's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Jira Server and Data Center and watch it for signs of compromise.

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 2024 · Atlassian scorecard · act-now radar.

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