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CVE-2025-40913

19
FAUCET Score

CVE-2025-40913 describes an integer overflow vulnerability within Net::Dropbear versions through 0.16 for Perl, stemming from an embedded, vulnerable version of the libtommath library (CVE-2023-36328). This vulnerability carries a CVSS score of 6.5 (Medium), indicating it can be exploited remotely with low attack complexity, potentially leading to limited confidentiality and integrity impacts. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 0.01, <= 0.16CPE match
cpe:2.3:a:atrodo:net\:\:dropbear:*:*:*:*:*:perl:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
2.5
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.27%
Probability of exploitation in next 30 days
EPSS Percentile
19.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0027 is in the 10th percentile among its peer group of 23,701 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

microsoftpatch availablevia msrc
Product: 20341-17086
microsoftpatch availablevia msrc
Product: 18110-17084
microsoftpatch availablevia msrc
Product: cbl2 tcl 8.6.13-3 on CBL Mariner 2.0
microsoftpatch availablevia msrc
Product: azl3 tcl 8.6.13-3 on Azure Linux 3.0

Vendor Advisories (1)

microsoft2025-Jul/CVE-2025-40913

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

Jul 8, 2025

References

github.com / advisories/GHSA-j3xv-6967-cv88
github.com / libtom/libtommath/pull/546
metacpan.org / release/ATRODO/Net-Dropbear-0.16/source/dropbear/libtommath/bn_mp_grow.c
cve.org / CVERecord