What is CVE-2020-25159?

CVE-2020-25159 is a critical-severity vulnerability in Real Time Automation 499es Ethernet/ip (Enip) Adaptor Source Code, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2020-11-24.

How severe is CVE-2020-25159?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Real Time Automation 499es Ethernet/ip (Enip) Adaptor Source Code

CVE-2020-25159

499ES EtherNet/IP (ENIP) Adaptor Source Code is vulnerable to a stack-based buffer overflow, which may allow an attacker to send a specially crafted packet that may result in a denial-of-service condition or code execution.

Vulnerability class: Buffer Overflow

Published 2020-11-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.030 (87.0th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 87.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.030 · newest: 0.030 · change: 0.000

Affected products

Real Time Automation 499es Ethernet/ip (Enip) Adaptor Source Code — versions unspecified
Rtautomation 499es Ethernet\/ip Adaptor
Rtautomation 499es Ethernet\/ip Adaptor Firmware

Weakness classification (CWE)

References

us-cert.cisa.gov/ics/advisories/icsa-20-324-03 (US Government Resource, Third Party Advisory)

Frequently asked questions

What is CVE-2020-25159?: CVE-2020-25159 is a critical-severity vulnerability in Real Time Automation 499es Ethernet/ip (Enip) Adaptor Source Code, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2020-11-24.
How severe is CVE-2020-25159?: Critical severity. CVSS v3 base score is 9.8 out of 10.