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No exploitation reportedFix available

CVE-2021-22948

No exploitation reported by the sources we read.

  • Published2021-09-23
  • Fixed in5.3.0
  • WeaknessCWE-338 · CWE-79

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Vulnerability in the generation of session IDs in revive-adserver < 5.3.0, based on the cryptographically insecure uniqid() PHP function. Under some circumstances, an attacker could theoretically be able to brute force session IDs in order to take over a specific account.

Timeline

dates in UTC
  1. 2021-09-2313:15CVE publishedNVD

Versions per branch

NVD
Revive-adserver revive adserver
BranchAffectedFixed in
5.3< 5.3.05.3.0
5.3= 5.3.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Revive-adserver revive adserver to 5.3.0

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.17.1read 2026-10-23
  • NVDCVSS 2.04.3read 2026-10-23
  • CNAweakness (CWE)CWE-79known since 2026-10-23
  • NVDweakness (CWE)CWE-338read 2026-10-23
  • FIRST EPSSEPSS score2.7 %2026-11-08
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
Published
2021-09-23
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-27g5-f3jp-4f93

Frequently asked questions

What is CVE-2021-22948?

Vulnerability in the generation of session IDs in revive-adserver < 5.3.0, based on the cryptographically insecure uniqid() PHP function. Under some circumstances, an attacker could theoretically be able to brute force session IDs in order to take over a specific account.

Is CVE-2021-22948 actively exploited?

Active exploitation of CVE-2021-22948 has not been confirmed. Its EPSS score was 2.7% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-22948?

CVE-2021-22948 has a CVSS v3 base score of 7.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N.

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