CVE-2021-26474Public exploitNetwork attack vector

Unauthenticated HTTP response disclosure via arbitrary proxy request

Published Jun 8, 2021 · Updated Sep 16, 2024

Server-side request forgery in Vembu BDR Suite 4.2.0.1 allows remote attackers to read arbitrary HTTP responses without authentication. The /api/tutorial/formhandler.php endpoint accepts attacker-controlled ServerName and PortNo values and returns the fetched response body. Any network client reaching TCP port 6060 can relay HTTP GET requests through the backup server to internal or external services.

CVSS severity8.8
High
EPSS probability0.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side request forgery in Vembu BDR Suite 4.2.0.1 allows remote attackers to read arbitrary HTTP responses without authentication. The /api/tutorial/formhandler.php endpoint accepts attacker-controlled ServerName and PortNo values and returns the fetched response body. Any network client reaching TCP port 6060 can relay HTTP GET requests through the backup server to internal or external services.

The record

CVE
CVE-2021-26474
Published
Jun 8, 2021
Updated
Sep 16, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-352, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 8, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
8.6MITRECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
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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