CVE-2021-22871

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

2.12% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 80.3% of scored records. A rank, not a probability.

NVD base score

4.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-01-21 19:15Z5 YR AGO

Last updated

2024-08-03 18:51Z2 YR AGO

Reserved

2021-01-06

Assigning CNA

hackerone

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')Base

Data version

5.1

Document digest

9aa238216b775addba647cef9a3faa6b1ee3946e70ef4a5830fd5a4fb16f51dc

• www.revive-adserver.comhttps://www.revive-adserver.com/security/revive-sa-2021-001/x_refsource_MISC
• hackerone.comhttps://hackerone.com/reports/819362x_refsource_MISC
• github.comhttps://github.com/revive-adserver/revive-adserver/commit/89b88ce26x_refsource_MISC
• github.comhttps://github.com/revive-adserver/revive-adserver/commit/62a2a0439x_refsource_MISC
• seclists.org20210122 [REVIVE-SA-2021-001] Revive Adserver Vulnerabilitieshttp://seclists.org/fulldisclosure/2021/Jan/60mailing-listx_refsource_FULLDISC
• packetstormsecurity.comhttp://packetstormsecurity.com/files/161070/Revive-Adserver-5.0.5-Cross-Site-Scripting-Open-Redirect.htmlx_refsource_MISC