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CVE-2020-28194

31
FAUCET Score

CVE-2020-28194 describes a critical variable underflow vulnerability in accel-ppp's radius/packet.c, affecting accel-ppp products. This flaw occurs when processing RADIUS vendor-specific attributes with a length field less than 2. With a CVSS score of 9.8 (Critical), this vulnerability allows for arbitrary code execution if an attacker controls the RADIUS server, posing a significant risk due to its network-based attack vector and low attack complexity. While there is no evidence of active exploitation (KEV: No) and no public exploit code (Metasploit, Nuclei, ExploitDB: None), the vulnerability has garnered considerable community discussion with 10 mentions, indicating awareness among security researchers.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.12.0-e9d369aCPE matchmatch criteria
cpe:2.3:a:accel-ppp:accel-ppp:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.70%
Probability of exploitation in next 30 days
EPSS Percentile
84.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0270 is in the 75th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / accel-ppp/accel-ppp/commit/e9d369aa0054312b7633e964e9f7eb323f1f3d69
PatchThird Party Advisory
github.com / accel-ppp/accel-ppp/security/advisories/GHSA-2m44-rh3c-x4gr
PatchThird Party Advisory