CVE-2021-30108Public exploitNetwork attack vector

Server-side requests via unvalidated Referer return URL

Published May 24, 2021 · Updated Aug 3, 2024

SSRF in Feehi CMS 2.1.1 allows remote attackers to make the server contact an arbitrary URL through the login flow. The login endpoint stores an unvalidated Referer as the session return URL, and the redirect handler accepts the resulting absolute URL. Exploitation requires a self-registered account and successful login; the public record does not identify which response data is exposed or altered.

CVSS severity9.1
Critical
EPSS probability1.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Feehi CMS 2.1.1 allows remote attackers to make the server contact an arbitrary URL through the login flow. The login endpoint stores an unvalidated Referer as the session return URL, and the redirect handler accepts the resulting absolute URL. Exploitation requires a self-registered account and successful login; the public record does not identify which response data is exposed or altered.

The record

CVE
CVE-2021-30108
Published
May 24, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 24, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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.

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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 exploitPublished

Weakness, pattern, technique

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

Public exploit references

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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