Known Exploited Vulnerability
9.8
CRITICAL
CVE-2021-26084
Atlassian Confluence Server and Data Center Object - [Actively Exploited]
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.

INFO

Published Date :

Aug. 30, 2021, 7:15 a.m.

Last Modified :

Aug. 8, 2023, 2:21 p.m.

Source :

[email protected]

Remotely Exploitable :

Yes !

Impact Score :

5.9

Exploitability Score :

3.9
CISA Notification
CISA KEV (Known Exploited Vulnerabilities)

For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.

Description :

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

Required Action :

Apply updates per vendor instructions.

Public PoC/Exploit Available at Github

CVE-2021-26084 has a 130 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

Affected Products

The following products are affected by CVE-2021-26084 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Atlassian confluence_server
2 Atlassian confluence_data_center
: Total Affected Vendor : 1 | Products : 2
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-26084.

URL Resource
http://packetstormsecurity.com/files/167449/Atlassian-Confluence-Namespace-OGNL-Injection.html Exploit Third Party Advisory VDB Entry
https://jira.atlassian.com/browse/CONFSERVER-67940 Issue Tracking Patch Vendor Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Profile Photo
4ra1n/poc-runner

Small & Fast Vulnerability Scanner Engine based on XRAY YAML Rule | 基于 XRAY YAML 规则的超轻量快速漏洞扫描引擎 | 可执行文件体积仅 2 MB

poc security vulnerability vulnerability-detection vulnerability-scanner web-security web-vulnerability-scanner

Batchfile Go ANTLR

Updated: 1 week, 1 day ago
50 stars 9 fork 9 watcher
Born at : Aug. 26, 2024, 11:11 a.m. This repo has been linked 23 different CVEs too.
Profile Photo
ChalkingCode/ExploitedDucks

A super simple Cisa KEV lookup CLI tool leveraging DuckDB

Python

Updated: 1 month, 2 weeks ago
1 stars 0 fork 0 watcher
Born at : July 2, 2024, 7:56 p.m. This repo has been linked 33 different CVEs too.
Profile Photo
onewinner/VulToolsKit

红队武器库漏洞利用工具合集整理

HTML

Updated: 1 week, 1 day ago
188 stars 30 fork 30 watcher
Born at : June 27, 2024, 9:28 a.m. This repo has been linked 54 different CVEs too.
Profile Photo
BBD-YZZ/Confluence-RCE

confluence rce (CVE-2021-26084, CVE-2022-26134, CVE-2023-22527)

Python

Updated: 3 weeks ago
2 stars 0 fork 0 watcher
Born at : May 29, 2024, 3:20 a.m. This repo has been linked 3 different CVEs too.
Profile Photo
0xMarcio/cve

Latest CVEs with their Proof of Concept exploits.

Python

Updated: 1 week, 1 day ago
5 stars 1 fork 1 watcher
Born at : May 24, 2024, 11:02 a.m. This repo has been linked 78 different CVEs too.
Profile Photo
nahcusira/CVE-2021-26084

None

Updated: 4 months, 1 week ago
0 stars 0 fork 0 watcher
Born at : April 28, 2024, 8:56 a.m. This repo has been linked 1 different CVEs too.
Profile Photo
NaInSec/CVE-PoC-in-GitHub

All CVE - PoC in GitHub

poc proofofconcept tester allcve cvegithub cvenew cvepoc cveupdate

Updated: 3 weeks ago
5 stars 2 fork 2 watcher
Born at : March 22, 2024, 3:58 p.m. This repo has been linked 928 different CVEs too.
Profile Photo
zecool/cve

None

Updated: 6 months ago
1 stars 0 fork 0 watcher
Born at : March 11, 2024, 1:21 p.m. This repo has been linked 930 different CVEs too.
Profile Photo
kdandy/pentest_tools

WebTest Tools

blueteam cybersecurity exploit pentest pentesting redteam security-tools shell tools website

Updated: 4 months ago
1 stars 0 fork 0 watcher
Born at : March 1, 2024, 8:47 a.m. This repo has been linked 22 different CVEs too.
Profile Photo
elinakrmova/RedTeam-Tools

None

Updated: 6 months, 3 weeks ago
1 stars 0 fork 0 watcher
Born at : Feb. 24, 2024, 1:05 p.m. This repo has been linked 22 different CVEs too.
Profile Photo
lions2012/Penetration_Testing_POC

渗透测试有关的POC、EXP、脚本、提权、小工具等---About penetration-testing python-script poc getshell csrf xss cms php-getshell domainmod-xss csrf-webshell cobub-razor cve rce sql sql-poc poc-exp bypass oa-getshell cve-cms

Assembly Python Shell PHP C++ C Go Ruby HTML Java

Updated: 1 month, 2 weeks ago
4 stars 0 fork 0 watcher
Born at : Feb. 7, 2024, 2:08 p.m. This repo has been linked 305 different CVEs too.
Profile Photo
d4n-sec/d4n-sec.github.io

None

CSS HTML JavaScript

Updated: 7 months, 2 weeks ago
0 stars 0 fork 0 watcher
Born at : Feb. 2, 2024, 2:11 p.m. This repo has been linked 494 different CVEs too.
Profile Photo
Lotus6/ConfluenceMemshell

Confluence CVE 2021，2022，2023 利用工具，支持命令执行，哥斯拉，冰蝎 内存马注入

Updated: 1 week, 5 days ago
409 stars 19 fork 19 watcher
Born at : Jan. 26, 2024, 1:11 p.m. This repo has been linked 3 different CVEs too.
Profile Photo
bakery312/Vulhub-Reproduce

None

Updated: 7 months, 3 weeks ago
0 stars 0 fork 0 watcher
Born at : Jan. 26, 2024, 10:07 a.m. This repo has been linked 161 different CVEs too.
Profile Photo
ouwenjin/-

None

Python Shell

Updated: 9 months ago
0 stars 0 fork 0 watcher
Born at : Dec. 12, 2023, 4:43 a.m. This repo has been linked 1 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-26084 vulnerability anywhere in the article.

  • Darktrace
Confluence CVE-2022-26134 Zero-Day: Detection & Guidance

What is WarmCookie malware?WarmCookie, also known as BadSpace [2], is a two-stage backdoor tool that provides functionality for threat actors to retrieve victim information and launch additional paylo ... Read more

Published Date: May 10, 2024 (4 months ago)
CVE-2022-26134 CVE-2022-30190 CVE-2022-22965 CVE-2021-26084

The following table lists the changes that have been made to the CVE-2021-26084 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CWE Remap by [email protected]

    Aug. 08, 2023

    Action Type Old Value New Value
    Changed CWE CWE-74 CWE-917
  • Modified Analysis by [email protected]

    Jun. 10, 2022

    Action Type Old Value New Value
    Changed Reference Type http://packetstormsecurity.com/files/167449/Atlassian-Confluence-Namespace-OGNL-Injection.html No Types Assigned http://packetstormsecurity.com/files/167449/Atlassian-Confluence-Namespace-OGNL-Injection.html Exploit, Third Party Advisory, VDB Entry
    Changed CPE Configuration OR *cpe:2.3:a:atlassian:confluence:*:*:*:*:*:*:*:* versions up to (excluding) 6.13.23 *cpe:2.3:a:atlassian:confluence:*:*:*:*:*:*:*:* versions from (including) 6.14.0 up to (excluding) 7.4.11 *cpe:2.3:a:atlassian:confluence:*:*:*:*:*:*:*:* versions from (including) 7.5.0 up to (excluding) 7.11.6 *cpe:2.3:a:atlassian:confluence_server:*:*:*:*:*:*:*:* versions from (including) 7.12.0 up to (excluding) 7.12.5 *cpe:2.3:a:atlassian:data_center:*:*:*:*:*:*:*:* versions up to (excluding) 6.13.23 *cpe:2.3:a:atlassian:data_center:*:*:*:*:*:*:*:* versions from (including) 6.14.0 up to (excluding) 7.4.11 *cpe:2.3:a:atlassian:jira_data_center:*:*:*:*:*:*:*:* versions from (including) 7.5.0 up to (excluding) 7.11.6 *cpe:2.3:a:atlassian:jira_data_center:*:*:*:*:*:*:*:* versions from (including) 7.12.0 up to (excluding) 7.12.5 OR *cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:* versions up to (excluding) 6.13.23 *cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:* versions from (including) 6.14.0 up to (excluding) 7.4.11 *cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:* versions from (including) 7.5.0 up to (excluding) 7.11.6 *cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:* versions from (including) 7.12.0 up to (excluding) 7.12.5 *cpe:2.3:a:atlassian:confluence_server:*:*:*:*:*:*:*:* versions up to (excluding) 6.13.23 *cpe:2.3:a:atlassian:confluence_server:*:*:*:*:*:*:*:* versions from (including) 6.14.0 up to (excluding) 7.4.11 *cpe:2.3:a:atlassian:confluence_server:*:*:*:*:*:*:*:* versions from (including) 7.5.0 up to (excluding) 7.11.6 *cpe:2.3:a:atlassian:confluence_server:*:*:*:*:*:*:*:* versions from (including) 7.12.0 up to (excluding) 7.12.5
  • CVE Modified by [email protected]

    Jun. 08, 2022

    Action Type Old Value New Value
    Added Reference http://packetstormsecurity.com/files/167449/Atlassian-Confluence-Namespace-OGNL-Injection.html [No Types Assigned]
  • CPE Deprecation Remap by [email protected]

    Mar. 30, 2022

    Action Type Old Value New Value
    Changed CPE Configuration OR *cpe:2.3:a:atlassian:data_center:*:*:*:*:*:*:*:* versions from (including) 7.12.0 from (excluding) 7.12.5 OR *cpe:2.3:a:atlassian:jira_data_center:*:*:*:*:*:*:*:* versions from (including) 7.12.0 from (excluding) 7.12.5
  • CPE Deprecation Remap by [email protected]

    Mar. 30, 2022

    Action Type Old Value New Value
    Changed CPE Configuration OR *cpe:2.3:a:atlassian:data_center:*:*:*:*:*:*:*:* versions from (including) 7.5.0 from (excluding) 7.11.6 OR *cpe:2.3:a:atlassian:jira_data_center:*:*:*:*:*:*:*:* versions from (including) 7.5.0 from (excluding) 7.11.6
  • Modified Analysis by [email protected]

    Mar. 25, 2022

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Feb. 23, 2022

    Action Type Old Value New Value
    Removed Reference http://packetstormsecurity.com/files/164013/Confluence-Server-7.12.4-OGNL-Injection-Remote-Code-Execution.html [Exploit, Third Party Advisory, VDB Entry]
    Removed Reference http://packetstormsecurity.com/files/164122/Atlassian-Confluence-WebWork-OGNL-Injection.html [Exploit, Third Party Advisory, VDB Entry]
  • CPE Deprecation Remap by [email protected]

    Dec. 13, 2021

    Action Type Old Value New Value
    Changed CPE Configuration OR *cpe:2.3:a:atlassian:confluence:*:*:*:*:*:*:*:* versions from (including) 7.12.0 from (excluding) 7.12.5 OR *cpe:2.3:a:atlassian:confluence_server:*:*:*:*:*:*:*:* versions from (including) 7.12.0 from (excluding) 7.12.5
  • Modified Analysis by [email protected]

    Sep. 16, 2021

    Action Type Old Value New Value
    Changed Reference Type http://packetstormsecurity.com/files/164122/Atlassian-Confluence-WebWork-OGNL-Injection.html No Types Assigned http://packetstormsecurity.com/files/164122/Atlassian-Confluence-WebWork-OGNL-Injection.html Exploit, Third Party Advisory, VDB Entry
  • CVE Modified by [email protected]

    Sep. 10, 2021

    Action Type Old Value New Value
    Added Reference http://packetstormsecurity.com/files/164122/Atlassian-Confluence-WebWork-OGNL-Injection.html [No Types Assigned]
  • Modified Analysis by [email protected]

    Sep. 07, 2021

    Action Type Old Value New Value
    Changed Reference Type http://packetstormsecurity.com/files/164013/Confluence-Server-7.12.4-OGNL-Injection-Remote-Code-Execution.html Exploit, Third Party Advisory http://packetstormsecurity.com/files/164013/Confluence-Server-7.12.4-OGNL-Injection-Remote-Code-Execution.html Exploit, Third Party Advisory, VDB Entry
  • CVE Modified by [email protected]

    Sep. 06, 2021

    Action Type Old Value New Value
    Changed Description In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists that would allow an authenticated user, and in some instances an unauthenticated user, to execute arbitrary code on a Confluence Server or Data Center instance. The vulnerable endpoints can be accessed by a non-administrator user or unauthenticated user if ‘Allow people to sign up to create their account’ is enabled. To check whether this is enabled go to COG > User Management > User Signup Options. 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. 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.
  • Initial Analysis by [email protected]

    Sep. 02, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:P/A:P)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Changed Reference Type http://packetstormsecurity.com/files/164013/Confluence-Server-7.12.4-OGNL-Injection-Remote-Code-Execution.html No Types Assigned http://packetstormsecurity.com/files/164013/Confluence-Server-7.12.4-OGNL-Injection-Remote-Code-Execution.html Exploit, Third Party Advisory
    Changed Reference Type https://jira.atlassian.com/browse/CONFSERVER-67940 No Types Assigned https://jira.atlassian.com/browse/CONFSERVER-67940 Issue Tracking, Patch, Vendor Advisory
    Added CWE NIST CWE-74
    Added CPE Configuration OR *cpe:2.3:a:atlassian:confluence:*:*:*:*:*:*:*:* versions up to (excluding) 6.13.23 *cpe:2.3:a:atlassian:confluence:*:*:*:*:*:*:*:* versions from (including) 6.14.0 up to (excluding) 7.4.11 *cpe:2.3:a:atlassian:confluence:*:*:*:*:*:*:*:* versions from (including) 7.5.0 up to (excluding) 7.11.6 *cpe:2.3:a:atlassian:confluence:*:*:*:*:*:*:*:* versions from (including) 7.12.0 up to (excluding) 7.12.5 *cpe:2.3:a:atlassian:data_center:*:*:*:*:*:*:*:* versions up to (excluding) 6.13.23 *cpe:2.3:a:atlassian:data_center:*:*:*:*:*:*:*:* versions from (including) 6.14.0 up to (excluding) 7.4.11 *cpe:2.3:a:atlassian:data_center:*:*:*:*:*:*:*:* versions from (including) 7.5.0 up to (excluding) 7.11.6 *cpe:2.3:a:atlassian:data_center:*:*:*:*:*:*:*:* versions from (including) 7.12.0 up to (excluding) 7.12.5
  • CVE Modified by [email protected]

    Sep. 01, 2021

    Action Type Old Value New Value
    Added Reference http://packetstormsecurity.com/files/164013/Confluence-Server-7.12.4-OGNL-Injection-Remote-Code-Execution.html [No Types Assigned]
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-26084 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-26084 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

97.41 }} 0.04%

score

0.99942

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
: