CVE-2021-35377Network attack vector

Script execution via unescaped portal parameters

Published Mar 6, 2023 · Updated Jul 9, 2026

Reflected XSS in VICIdial 2.9-401c, 2.10-415c, 2.14-597c, and 2.14-610c allows remote attackers to execute script via crafted requests. The login and administration portal parameters handled by KHOMP_admin.php, vicidial-grey.php, and vicidial.php are rendered without proper sanitization or escaping. Exploitation requires an administrator to follow a crafted request, after which injected JavaScript can manipulate the page and expose cookie values.

CVSS severity6.1
Medium
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in VICIdial 2.9-401c, 2.10-415c, 2.14-597c, and 2.14-610c allows remote attackers to execute script via crafted requests. The login and administration portal parameters handled by KHOMP_admin.php, vicidial-grey.php, and vicidial.php are rendered without proper sanitization or escaping. Exploitation requires an administrator to follow a crafted request, after which injected JavaScript can manipulate the page and expose cookie values.

The record

CVE
CVE-2021-35377
Published
Mar 6, 2023
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1539
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 6, 2023CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record 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

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1539Steal Web Session Cookie

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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