CVE-2021-26084

criticalknown exploitedpublic exploitcovered by 2 sourcesfirst seen 2021-11-03

Actively exploited. CVE-2021-26084 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.

Public exploit code is available. Proof-of-concept or working exploit code for CVE-2021-26084 is indexed in Metasploit, Exploit-DB, GitHub PoC and Nuclei. Expect opportunistic scanning and exploitation attempts — prioritize remediation.

Research from the NCSC designed to eradicate vulnerability classes and make the top-level mitigations easier to implement.

CSIRTS triage

Other

What: Research aims to categorize vulnerability classes for easier mitigation.
Who is affected: Organizations managing vulnerabilities.
Urgency: Remediation is important for improving vulnerability management.
Action: Review the research findings for implementation.

AI-assisted analysis generated from the source advisory — verify against the original.

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Exploitation outlook

Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 100% of all EPSS-scored CVEs.

Exploit availability

Public exploit or proof-of-concept code for CVE-2021-26084 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.

MetasploitA Metasploit Framework module targets this CVE — weaponized, point-and-click exploitation.look it up ↗
Exploit-DBA public exploit is published in the Exploit-DB archive.look it up ↗
GitHub PoCPublic proof-of-concept repositories on GitHub reference this CVE.look it up ↗
NucleiA nuclei-templates detection/PoC template exists for this CVE.look it up ↗

Advisory coverage (2)

unknownexploitedA method to assess 'forgivable' vs 'unforgivable' vulnerabilitiesncsc-uk · 2025-01-28
criticalexploitedCVE-2021-26084: Atlassian Confluence Server and Data Center Object-Graph Navigation Language (OGNL) Injection …cisa-kev · 2021-11-03

External references

NVD record for CVE-2021-26084

CVE.org record

CISA KEV catalog

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