CVE-2021-22875Public exploitNetwork attack vector

Reflected XSS via partially escaped pagination parameter

Published Jan 28, 2021 · Updated Aug 3, 2024

Reflected XSS in Revive Adserver before 5.1.1 allows remote attackers to execute JavaScript through a crafted stats.php URL. The statistics parameter loader preserves setPerPage as a string and prints it into an HTML attribute without neutralizing every quote, permitting attribute injection. Exploitation requires a user with interface access to open the link and press a complex key combination; injected code cannot read the session cookie.

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 before 5.1.1 allows remote attackers to execute JavaScript through a crafted stats.php URL. The statistics parameter loader preserves setPerPage as a string and prints it into an HTML attribute without neutralizing every quote, permitting attribute injection. Exploitation requires a user with interface access to open the link and press a complex key combination; injected code cannot read the session cookie.

The record

CVE
CVE-2021-22875
Published
Jan 28, 2021
Updated
Aug 3, 2024
Vendor
Revive Adserver Project
Product
Revive Adserver
Classifications
CWE-79, T1203
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

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