CVE-2021-22948

mediumpriority · track · 29EPSS 0.027 · 86 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

2.71% (86th) EPSS

CVSS 4.3 · medium

Is it mine?

3 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

7.1

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 4.3–7.1

v2.04.3mediumAV:N/AC:M/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 8.6 · impact 2.9

v3.17.1highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 4.2

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-338USprimaryCWE-79US

affected products (3)

Products and version ranges known to be affected.

n/a https://github.com/revive-adserver/revive-adserver≤ Fixed version v5.3.0enisa_euvdEU
revive-adserver revive adserver< 5.3.0nvdUScpe:2.3:a:revive-adserver:revive_adserver:*:*:*:*:*:*:*:*
revive-adserver revive adserver= 5.3.0nvdUScpe:2.3:a:revive-adserver:revive_adserver:*:*:*:*:*:*:*:*

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2021-09-23modified 2026-06-17

related (267)

Related entries.

ID	severity	EPSS	exploitable	published
CVE-2024-53704US	critical9.8OT critical	95.3% (100th)	KEV	2025-01-09
An Improper Authentication vulnerability in the SSLVPN authentication mechanism allows a remote attacker to bypass authentication.
CVE-2019-5420US	critical9.8OT critical	89.3% (100th)	Exploit	2019-03-27
A remote code execution vulnerability in development mode Rails <5.2.2.1, <6.0.0.beta3 can allow an attacker to guess the automatically generated development mode secret token. Thi…
CVE-2023-34039US	critical9.8OT high	67.2% (99th)	Exploit	2023-08-29
Aria Operations for Networks contains an Authentication Bypass vulnerability due to a lack of unique cryptographic key generation. A malicious actor with network access to Aria Ope…
CVE-2008-0166US	high7.5	70.7% (99th)	Exploit	2008-05-13
OpenSSL 0.9.8c-1 up to versions before 0.9.8g-9 on Debian-based operating systems uses a random number generator that generates predictable numbers, which makes it easier for remot…
CVE-2009-2367US	critical9.8	23.2% (98th)	Exploit	2009-07-08
cgi-bin/makecgi-pro in Iomega StorCenter Pro generates predictable session IDs, which allows remote attackers to hijack active sessions and gain privileges via brute force guessing…

+262 more

references (7)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan