CVE-2025-15638

Perl · Net::Dropbear

Net::Dropbear versions before 0.14 contain outdated libtomcrypt dependencies, exposing the application to multiple known cryptographic vulnerabilities.

Executive summary

The Perl Net::Dropbear library contains vulnerable legacy dependencies that expose the system to critical cryptographic flaws.

Vulnerability

This vulnerability stems from the inclusion of outdated libtomcrypt (v1.18.1 or earlier) libraries within the Dropbear component, which are susceptible to well-documented cryptographic weaknesses (CVE-2016-6129 and CVE-2018-12437).

Business impact

The reliance on insecure cryptographic libraries poses a severe risk to data confidentiality and integrity. With a CVSS score of 10.0, this flaw could allow attackers to bypass security controls or decrypt sensitive communications, leading to significant data breaches and a complete loss of trust in system communications.

Remediation

Immediate Action: Upgrade Net::Dropbear to version 0.14 or later to ensure the removal of vulnerable libtomcrypt components.

Proactive Monitoring: Review system logs for unusual cryptographic handshake failures or unauthorized access patterns involving the Dropbear service.

Compensating Controls: Restrict network access to the affected service using firewall rules to minimize exposure until the patch can be deployed.

Exploitation status

Public Exploit Available: Unknown

Analyst recommendation

Given the critical nature of this vulnerability and its maximum CVSS rating, immediate action is required. Organizations must prioritize updating the Net::Dropbear package to remediate the underlying dependency risks and prevent potential cryptographic compromise.