CVE-2021-22874Public exploitNetwork attack vector

Script execution via unescaped period_preset parameter

Published Jan 28, 2021 · Updated Aug 3, 2024

Reflected XSS in Revive Adserver 5.1.0 and earlier allows remote attackers to execute JavaScript via a crafted period_preset value. AuditDaySpanField.php embeds the value in a JavaScript string assigned to the preset form field without escaping quotes or backslashes. Exploitation requires a user with interface access to open the crafted URL, after which the injected script executes in that user's browser context.

CVSS severity4.3
Medium
EPSS probability18.24%
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 Revive Adserver 5.1.0 and earlier allows remote attackers to execute JavaScript via a crafted period_preset value. AuditDaySpanField.php embeds the value in a JavaScript string assigned to the preset form field without escaping quotes or backslashes. Exploitation requires a user with interface access to open the crafted URL, after which the injected script executes in that user's browser context.

The record

CVE
CVE-2021-22874
Published
Jan 28, 2021
Updated
Aug 3, 2024
Vendor
Revive Adserver Project
Product
Revive Adserver
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 28, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=Fixed in 5.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Revive Adserver Project · Revive Adserverversion=Fixed in 5.1.1

Published CVSS scores

4.3Revive AdserverCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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