CVE-2025-15604
Amon2 versions before 6.17 for Perl use an insecure random_string implementation for security functions
Description
Amon2 versions before 6.17 for Perl use an insecure random_string implementation for security functions. In versions 6.06 through 6.16, the random_string function will attempt to read bytes from the /dev/urandom device, but if that is unavailable then it generates bytes by concatenating a SHA-1 hash seeded with the built-in rand() function, the PID, and the high resolution epoch time. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage. Before version 6.06, there was no fallback when /dev/urandom was not available. Before version 6.04, the random_string function used the built-in rand() function to generate a mixed-case alphanumeric string. This function may be used for generating session ids, generating secrets for signing or encrypting cookie session data and generating tokens used for Cross Site Request Forgery (CSRF) protection.
INFO
Published Date :
March 28, 2026, 7:16 p.m.
Last Modified :
April 1, 2026, 3:16 p.m.
Remotely Exploit :
Yes !
Source :
9b29abf9-4ab0-4765-b253-1875cd9b441e
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 3.1 | CRITICAL | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Update Amon2 to version 6.17 or later.
- Verify secure random string generation.
- Review and regenerate sensitive tokens and keys.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-15604.
| URL | Resource |
|---|---|
| https://github.com/tokuhirom/Amon/pull/135 | Issue Tracking Patch |
| https://metacpan.org/release/TOKUHIROM/Amon2-6.17/changes | Product |
| https://metacpan.org/release/TOKUHIROM/Amon2-6.17/diff/TOKUHIROM/Amon2-6.16#lib/Amon2/Util.pm | Product |
| https://security.metacpan.org/docs/guides/random-data-for-security.html | Third Party Advisory |
| http://www.openwall.com/lists/oss-security/2026/03/28/4 | Mailing List Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-15604 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-15604
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-15604 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-15604 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Apr. 01, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H -
Initial Analysis by [email protected]
Mar. 31, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CPE Configuration OR *cpe:2.3:a:tokuhirom:amon2:*:*:*:*:*:perl:*:* versions up to (excluding) 6.17 Added Reference Type CVE: http://www.openwall.com/lists/oss-security/2026/03/28/4 Types: Mailing List, Third Party Advisory Added Reference Type CPANSec: https://github.com/tokuhirom/Amon/pull/135 Types: Issue Tracking, Patch Added Reference Type CPANSec: https://metacpan.org/release/TOKUHIROM/Amon2-6.17/changes Types: Product Added Reference Type CPANSec: https://metacpan.org/release/TOKUHIROM/Amon2-6.17/diff/TOKUHIROM/Amon2-6.16#lib/Amon2/Util.pm Types: Product Added Reference Type CPANSec: https://security.metacpan.org/docs/guides/random-data-for-security.html Types: Third Party Advisory -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Mar. 28, 2026
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2026/03/28/4 -
New CVE Received by 9b29abf9-4ab0-4765-b253-1875cd9b441e
Mar. 28, 2026
Action Type Old Value New Value Added Description Amon2 versions before 6.17 for Perl use an insecure random_string implementation for security functions. In versions 6.06 through 6.16, the random_string function will attempt to read bytes from the /dev/urandom device, but if that is unavailable then it generates bytes by concatenating a SHA-1 hash seeded with the built-in rand() function, the PID, and the high resolution epoch time. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage. Before version 6.06, there was no fallback when /dev/urandom was not available. Before version 6.04, the random_string function used the built-in rand() function to generate a mixed-case alphanumeric string. This function may be used for generating session ids, generating secrets for signing or encrypting cookie session data and generating tokens used for Cross Site Request Forgery (CSRF) protection. Added CWE CWE-338 Added CWE CWE-340 Added Reference https://github.com/tokuhirom/Amon/pull/135 Added Reference https://metacpan.org/release/TOKUHIROM/Amon2-6.17/changes Added Reference https://metacpan.org/release/TOKUHIROM/Amon2-6.17/diff/TOKUHIROM/Amon2-6.16#lib/Amon2/Util.pm Added Reference https://security.metacpan.org/docs/guides/random-data-for-security.html