CVE-2019-5440

mediumpriority · track · 33EPSS 0.016 · 75 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.58% (75th) EPSS

CVSS 6.8 · medium

Is it mine?

2 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-27

Use of cryptographically weak PRNG in the password recovery token generation of Revive Adserver < v4.2.1 causes a potential authentication bypass attack if an attacker exploits the password recovery functionality. In lib/OA/Dal/PasswordRecovery.php, the function generateRecoveryId() generates a password reset token that relies on the PHP uniqid function and consequently depends only on the current server time, which is often visible in an HTTP Date header.

cvss

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

8.1

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.8–8.1

v2.06.8mediumAV:N/AC:M/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 8.6 · impact 6.4

v3.08.1highCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 2.2 · impact 5.9

v3.07.4highCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-338USprimary

affected products (2)

Products and version ranges known to be affected.

Revive Revive Adserver≤ Fixed in 4.2.1enisa_euvdEU
revive-adserver revive adserver< 4.2.1nvdUScpe: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 2019-05-28modified 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 (5)

External citations — patches, advisories, analysis.

https://hackerone.com/reports/576504 cnnvd
https://nvd.nist.gov/vuln/detail/CVE-2019-5440 cnnvd
https://www.revive-adserver.com/Patchcnnvd
https://hackerone.com/reports/576504 enisa_euvd
https://hackerone.com/reports/576504ExploitThird Party Advisorynvd

scry

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

Free scan