CVE-2020-29445Network attack vector

Internal network probing via calendar location SSRF

Published May 7, 2021 · Updated Feb 12, 2025

Blind SSRF in Atlassian Confluence Server before 7.4.8 and 7.5.0 through 7.10.x allows remote authenticated users to probe internal services. The Team Calendars REST API accepts an attacker-controlled location parameter and makes a server-side request whose response behavior reveals host and port reachability. A low-privileged Confluence account is required, and the blind oracle reveals reachability rather than the requested response content.

CVSS severity4.3
Medium
EPSS probability1.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Blind SSRF in Atlassian Confluence Server before 7.4.8 and 7.5.0 through 7.10.x allows remote authenticated users to probe internal services. The Team Calendars REST API accepts an attacker-controlled location parameter and makes a server-side request whose response behavior reveals host and port reachability. A low-privileged Confluence account is required, and the blind oracle reveals reachability rather than the requested response content.

The record

CVE
CVE-2020-29445
Published
May 7, 2021
Updated
Feb 12, 2025
Vendor
Atlassian
Product
Confluence Server
Classifications
CWE-918, CAPEC-664, T1046
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 7, 2021CVE publishedPublication date reported by the CVE source.
  2. Feb 12, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.5.0 <unspecified
  2. Affected versionversion=unspecified <7.11.0
  3. Affected versionversion=unspecified <7.4.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Atlassian · Confluence Serverversion=7.5.0 <unspecified; version=unspecified <7.11.0; version=unspecified <7.4.8

Published CVSS scores

4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
4.0NIST NVDAV:N/AC:L/Au:S/C:P/I:N/A:N
4.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
CAPEC-664Server Side Request Forgery
T1046Network Service Discovery

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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