Net::Dropbear versions through 0.16 for Perl contains a dependency that may be susceptible to an integer overflow

published 2025-07-16 15 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-21701

cvss: 6.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 25%
public exploits: 0; none known

Net::Dropbear versions through 0.16 for Perl contains a dependency that may be susceptible to an integer overflow.

Net::Dropbear embeds a version of the libtommath library that is susceptible to an integer overflow associated with CVE-2023-36328.

Patch / fix

distros 1 links 1

tcl Azure Linux 3.0 8.6.13-2

azure linux advisories AZL-65571

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

github.com/libtom/libtommath#546 pull request

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 15 mo ago (2025-07-16)

Exploit prediction

0.33% chance of exploitation in the next 30 days, higher than 25% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CNA	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected products

ATRODO Net::Dropbear

Classification

Weakness

CWE-1395 Dependency on Vulnerable Third-Party Component

References

Sources

CVE List CVE-2025-40913
NVD CVE-2025-40913

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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

Summary