CVE-2020-23534Public exploitNetwork attack vector

Unauthenticated SSRF via source URL in Upgrade.php

Published Feb 25, 2021 · Updated Aug 4, 2024

Server-side request forgery in gopeak masterlab 2.1.5 allows remote attackers to make the server request attacker-chosen URLs. The Upgrade.php /Upgrade/run handler accepts the source parameter and passes a supplied gopher URL to the server-side request mechanism, enabling requests from the Masterlab host to internal or external destinations. No authentication or user interaction is required, and the documented proof of concept demonstrates network-reachable exploitation; confidentiality, integrity, and availability impact depend on reachable services and responses.

CVSS severity9.8
Critical
EPSS probability1.25%
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 gopeak masterlab 2.1.5 allows remote attackers to make the server request attacker-chosen URLs. The Upgrade.php /Upgrade/run handler accepts the source parameter and passes a supplied gopher URL to the server-side request mechanism, enabling requests from the Masterlab host to internal or external destinations. No authentication or user interaction is required, and the documented proof of concept demonstrates network-reachable exploitation; confidentiality, integrity, and availability impact depend on reachable services and responses.

The record

CVE
CVE-2020-23534
Published
Feb 25, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 25, 2021CVE 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

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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