Vulnerability in the generation of session IDs in revive-adserver < 5.3.0, based on the cryptographically insecure uniqid() PHP function.

published 2021-09-23 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-10076

cvss: 7.1; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 2.7%; EPSS 2.7% chance of exploitation in 30 days, percentile 86%
public exploits: 0; none known

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.

Patch / fix

fixed in 1 links 1

revive-adserver revive_adserver 5.3.0

revive-adserver.com/security/revive-sa-2021-005/ advisory

Exploit prediction

2.71% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

hackerone.com https://hackerone.com/reports/1187820 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:P/I:N/A:N

Affected products

n/a https://github.com/revive-adserver/revive-adserver

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation
CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

References

revive-adserver.com /security/revive-sa-2021-005/
patch, vendor-advisory
hackerone.com /reports/1187820
exploit, third-party-advisory

Sources

CVE List CVE-2021-22948
NVD CVE-2021-22948

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary