What is CVE-2020-28194?

CVE-2020-28194 is a critical-severity vulnerability in Accel-Ppp, classified under Integer Underflow. CVSS score: 9.8/10. Published 2021-02-01.

How severe is CVE-2020-28194?

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

Integer overflow in Accel-Ppp

CVE-2020-28194

Variable underflow exists in accel-ppp radius/packet.c when receiving a RADIUS vendor-specific attribute with length field is less than 2. It has an impact only when the attacker controls the RADIUS server, which can lead to arbitrary code execution.

Published 2021-02-01 · 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 (86.9th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 86.9% 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

Accel-Ppp

Weakness classification (CWE)

CWE-191 — Integer Underflow

References

github.com/accel-ppp/accel-ppp/security/advisories/GHSA-2m44-rh3c-x4gr (Patch, Third Party Advisory)
github.com/accel-ppp/accel-ppp/commit/e9d369aa0054312b7633e964e9f7eb323f1f3d69 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2020-28194?: CVE-2020-28194 is a critical-severity vulnerability in Accel-Ppp, classified under Integer Underflow. CVSS score: 9.8/10. Published 2021-02-01.
How severe is CVE-2020-28194?: Critical severity. CVSS v3 base score is 9.8 out of 10.