Skip to main content

CVE-2021-26084

Atlassian — Atlassian Confluence Server and Data Center Object-Graph Navigation Language (OGNL) Injection Vulnerability

Atlassian · CWE-917 · in CISA KEV since 2021-11-03

ExigentKEV since 2021 · listed over a yearRansomwareCISA KEVActively Exploited
94

EVRS 94 of 100 Immediate

Out-of-Band / Urgent Remediation

Rank 20 of 2,960 tracked

Download PDF

Why it scores 94

Evidence available: 6 of 7 signals

Listed in the CISA KEV catalog, and associated with known ransomware campaigns.

  • CISA KEVApplied
  • RansomwareApplied
  • Vendor exploitationDid not apply
  • EPSSApplied
  • Microsoft Exploitability IndexNot applicable
  • Pre-patch disclosureNo data
  • KEV recencyDid not apply
  • CVSSApplied

The band answers “how soon”, not “how bad”. No data for: Pre-patch disclosure. Why some signals show no data

Fix

Patch or fixed version identified

CISA required action

Fixed in

confluence data center: update to 6.13.23 or later | confluence data center: update to 7.4.11 or later | confluence data center: update to 7.11.6 or later | confluence data center: update to 7.12.5 or later | confluence server: update to 6.13.23 or later | confluence server: update to 7.4.11 or later

Affected versions

  • confluence data center< 6.13.23>= 6.14.0 < 7.4.11>= 7.5.0 < 7.11.6>= 7.12.0 < 7.12.5
  • confluence server< 6.13.23>= 6.14.0 < 7.4.11>= 7.5.0 < 7.11.6>= 7.12.0 < 7.12.5

Remediation

Apply updates per vendor instructions.

Fixed versions from NVD.

Evidence

Each value with its source
MeasureValueSource
CVSS base scoreHow severe the flaw is in itself. It does not say how likely an attack is. 9.8 NVD
FIRST EPSSFIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs. 0.999 (99.99th pctl) FIRST EPSS
Actively exploitedWhether a source of record has confirmed attacks using it in the wild. Confirmed CISA KEV
Ransomware campaign useWhether CISA has seen ransomware operators use it. Known CISA KEV
CISA remediation deadlineThe date US federal agencies must have fixed or mitigated it. 2021-11-17 · KEV since 2021 · listed over a year CISA KEV
Public exploit moduleA module existing is not the same as active exploitation. Public module exists Metasploit
EUVD cross-referenceENISA's record: CVSS 9.8 (v3.1), assigned by atlassian. Listed ENISA EUVD

Description

NVD

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.

What CISA says to do

Public module

Metasploit lists a public excellent-rank module for this CVE: Atlassian Confluence WebWork OGNL Injection (multi/http/atlassian_confluence_webwork_ognl_injection). A module existing is not the same as active exploitation; see metasploit.com.