CVE-2021-40604Network attack vector

Arbitrary server requests via dynamic class-name generation

Published Jun 13, 2022 · Updated Aug 4, 2024

SSRF in Invision Community IPS Community Suite before 4.6.2 allows remote authenticated users to make arbitrary server-side requests. Dynamic class-name generation accepts attacker-controlled URLs, including phar-scheme references that can invoke PHP deserialization. Authentication is normally required, although the published record says some paths are reachable without it; successful requests can reach resources accessible to the server or trigger object deserialization.

CVSS severity9.1
Critical
EPSS probability1.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Invision Community IPS Community Suite before 4.6.2 allows remote authenticated users to make arbitrary server-side requests. Dynamic class-name generation accepts attacker-controlled URLs, including phar-scheme references that can invoke PHP deserialization. Authentication is normally required, although the published record says some paths are reachable without it; successful requests can reach resources accessible to the server or trigger object deserialization.

The record

CVE
CVE-2021-40604
Published
Jun 13, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 13, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
6.4NIST NVDAV:N/AC:L/Au:N/C:P/I:P/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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