CVE-2020-25925Public exploitNetwork attack vector

Browser script execution via unneutralized p4 input

Published Jul 7, 2021 · Updated Aug 4, 2024

Cross-site scripting in IceWarp WebClient 10.3.5 allows remote attackers to execute arbitrary script through the calendar's p4 field. The Webmail Calendar accepts the attacker-controlled p4 value as active web content instead of neutralizing it before browser interpretation. No authentication is required, but a user must interact with the crafted content; successful execution can read or modify data available to the victim's browser session.

CVSS severity6.1
Medium
EPSS probability1.03%
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 IceWarp WebClient 10.3.5 allows remote attackers to execute arbitrary script through the calendar's p4 field. The Webmail Calendar accepts the attacker-controlled p4 value as active web content instead of neutralizing it before browser interpretation. No authentication is required, but a user must interact with the crafted content; successful execution can read or modify data available to the victim's browser session.

The record

CVE
CVE-2020-25925
Published
Jul 7, 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. Jul 7, 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

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

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 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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