davenardella snap7 s7_peer.cpp NegotiatePDULength out-of-bounds write
Priority MEDIUM 57CWE-119Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- Low · Low · Low
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00399 34th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| davenardella | snap7 | 1.4.0; 1.4.1; 1.4.2; 1.4.3 | — | No fix listed | CNA |
- snap7 Vendordavenardella Affected 1.4.0; 1.4.1; 1.4.2; 1.4.3 Fixed in — No fix listed CNA
CPE names CNA · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:davenardella:snap7:*:*:*:*:*:*:*:* | — | — | davenardella |
- cpe:2.3:a:davenardella:snap7:*:*:*:*:*:*:*:* Versions — — ·davenardella
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-16225
- 2026-10-03 Alias added: GHSA-cc6f-5g4h-cf75
References
More davenardella vulnerabilities
- TI-2026-75061 snap7 Out-of-Bounds Write via TSnap7MicroClient::opReadArea CVSS 4.0HIGH 8.3
- TI-2026-12717 davenardella snap7 ReadVar Request s7_server.cpp PerformFunctionRead out-of-bounds write CVSS 4.0MEDIUM 5.3
- TI-2026-61586 davenardella snap7 s7_micro_client.cpp opUpload memory corruption CVSS 4.0MEDIUM 5.1
- TI-2026-79727 Out-of-bounds write in Snap7 lets connected peers overflow buffers CVSS 4.0HIGH 8.3
Sources
- CVE-2026-16225 · CVE Program
- CVE-2026-16225 · NVD
- FIRST EPSS
- GHSA-cc6f-5g4h-cf75 · GitHub Advisory Database · CC BY 4.0
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