CVE-2020-21993Public exploitNetwork attack vector

Browser-session HTML execution via unsanitized email parameter

Published Apr 28, 2021 · Updated Aug 4, 2024

Reflected cross-site scripting in WEMS Limited Enterprise Manager 2.58 allows remote attackers to execute arbitrary HTML in a user's browser. The application returns the email GET parameter in its HTTP response without adequately sanitizing the value, causing the browser to interpret crafted markup in the affected site's context. Exploitation requires a user to open an attacker-crafted request; the published record establishes browser-session content execution but not server-side code execution.

CVSS severity6.1
Medium
EPSS probability0.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected cross-site scripting in WEMS Limited Enterprise Manager 2.58 allows remote attackers to execute arbitrary HTML in a user's browser. The application returns the email GET parameter in its HTTP response without adequately sanitizing the value, causing the browser to interpret crafted markup in the affected site's context. Exploitation requires a user to open an attacker-crafted request; the published record establishes browser-session content execution but not server-side code execution.

The record

CVE
CVE-2020-21993
Published
Apr 28, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 28, 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

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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