Buffer overflow in Davenardella Snap7
CVE-2026-16225
A security flaw has been discovered in davenardella snap7 up to 1.4.3. The impacted element is the function TSnap7Peer::NegotiatePDULength of the file src/core/s7_peer.cpp. The manipulation of the argument PDULength results in out-of-bounds write. The attack can be executed remotely. The exploit has been released to the public and may be used for attacks.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.004 (32.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 32.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Davenardella Snap7 — versions 1.4.0, 1.4.1, 1.4.2
Weakness classification (CWE)
References
- vuldb.com/vuln/380047 (technical-description, vdb-entry)
- vuldb.com/vuln/380047/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-16225 (third-party-advisory)
- vuldb.com/submit/858228 (third-party-advisory)
- github.com/davenardella/snap7/issues/17 (issue-tracking, exploit)
- github.com/davenardella/snap7/ (product)
Frequently asked questions
- What is CVE-2026-16225?
- CVE-2026-16225 is a medium-severity vulnerability in Davenardella Snap7, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 6.3/10. Published 2026-07-19.
- How severe is CVE-2026-16225?
- Medium severity. CVSS v3 base score is 6.3 out of 10.