CVE-2021-42535Network attack vector

Data disclosure via unneutralized webpage input

Published Jul 27, 2022 · Updated Apr 17, 2025

Cross-site scripting in VISAM VBASE Pro-RT/Server-RT Web Remote 11.6.0.6 allows remote attackers to expose browser-accessible data. The Web Remote output places user-controllable input into a public-facing webpage without correct neutralization; CISA does not identify the affected parameter or rendering path. Exploitation requires a victim to interact with the crafted content, and the documented impact is disclosure rather than data modification or service interruption.

CVSS severity5.3
Medium
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in VISAM VBASE Pro-RT/Server-RT Web Remote 11.6.0.6 allows remote attackers to expose browser-accessible data. The Web Remote output places user-controllable input into a public-facing webpage without correct neutralization; CISA does not identify the affected parameter or rendering path. Exploitation requires a victim to interact with the crafted content, and the documented impact is disclosure rather than data modification or service interruption.

The record

CVE
CVE-2021-42535
Published
Jul 27, 2022
Updated
Apr 17, 2025
Vendor
VISAM GmbH
Product
VBASE
Classifications
CWE-79
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 27, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 17, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=version 11.6.0.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

VISAM GmbH · VBASEversion=version 11.6.0.6

Published CVSS scores

5.3CISACVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/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.

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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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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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