CVE-2026-111280
snap7 through 1.4.3 contains an out-of-bounds write vulnerability in…
- Risk score
- 58/100
- CVSS
- 7.4 v3.1
- Exploit chance (30 days)
- 0.5%
- Published
- 15 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- snap7 through 1.4.3 contains an out-of-bounds write vulnerability in TSnap7MicroClient::opReadArea() that allows malicious S7 peers to overflow client buffers via an unchecked DataLength field. Rogue or impersonated PLCs can return crafted ReadVar responses causing memcpy of up to 65535 bytes into caller buffers, cras…
- Affected
- See advisory
- Fix
- Apply the vendor's security update; see the linked advisory.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 7.4 high
- Remotely exploitable without logging in
References
- https://github.com/davenardella/snap7
- https://github.com/davenardella/snap7/blob/30f37da3114024a71ba93f7fd855c680b97a406f/src/core/s7_micro_client.cpp#L136-L150
- https://github.com/davenardella/snap7/issues/31
- https://www.vulncheck.com/advisories/snap7-through-1.4.3-out-of-bounds-write-via-tsnap7microclient-opreadarea
Original description
snap7 through 1.4.3 contains an out-of-bounds write vulnerability in TSnap7MicroClient::opReadArea() that allows malicious S7 peers to overflow client buffers via an unchecked DataLength field. Rogue or impersonated PLCs can return crafted ReadVar responses causing memcpy of up to 65535 bytes into caller buffers, crashing SCADA, HMI, or gateway processes and corrupting memory.
Last activity 15 Oct 2026. Patch Forecast updates every hour.