CVE-2020-8603Network attack vector

Browser script execution via unvalidated logged URLs

Published May 27, 2020 · Updated Aug 4, 2024

Cross-site scripting in Trend Micro InterScan Web Security Virtual Appliance 6.5 allows remote attackers to tamper with its web interface. The logged-URL handler fails to validate user-supplied data before rendering it, allowing arbitrary script injection. Exploitation requires a target to visit a malicious page or open a malicious file; the injected script can alter the interface, and root execution requires chaining another flaw.

CVSS severity6.1
Medium
EPSS probability1.98%
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 Trend Micro InterScan Web Security Virtual Appliance 6.5 allows remote attackers to tamper with its web interface. The logged-URL handler fails to validate user-supplied data before rendering it, allowing arbitrary script injection. Exploitation requires a target to visit a malicious page or open a malicious file; the injected script can alter the interface, and root execution requires chaining another flaw.

The record

CVE
CVE-2020-8603
Published
May 27, 2020
Updated
Aug 4, 2024
Vendor
Trend Micro
Product
InterScan Web Security Virtual Appliance
Classifications
CWE-79, T1204.001, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 27, 2020CVE 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?

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

  1. Affected versionversion=6.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Trend Micro · InterScan Web Security Virtual Applianceversion=6.5

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.3Trend Micro Zero Day InitiativeCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001User Execution: Malicious Link
T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

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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