HOMEVULNERABILITIESCVE-2020-28194
CRITICAL

CVE-2020-28194

CWE-191Published: February 1, 2021· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2020-28194 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

accel-ppp1 product(s)
accel-ppp
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/accel-ppp/accel-ppp/commit/e9d369aa0054312b7633e964e9f7eb323f1f3d69
PATCHhttps://github.com/accel-ppp/accel-ppp/security/advisories/GHSA-2m44-rh3c-x4gr
PATCHhttps://github.com/accel-ppp/accel-ppp/commit/e9d369aa0054312b7633e964e9f7eb323f1f3d69
PATCHhttps://github.com/accel-ppp/accel-ppp/security/advisories/GHSA-2m44-rh3c-x4gr

All References (4)

→
https://github.com/accel-ppp/accel-ppp/commit/e9d369aa0054312b7633e964e9f7eb323f1f3d69Patch · Third Party Advisory
→
https://github.com/accel-ppp/accel-ppp/security/advisories/GHSA-2m44-rh3c-x4grPatch · Third Party Advisory
→
https://github.com/accel-ppp/accel-ppp/commit/e9d369aa0054312b7633e964e9f7eb323f1f3d69Patch · Third Party Advisory
→
https://github.com/accel-ppp/accel-ppp/security/advisories/GHSA-2m44-rh3c-x4grPatch · Third Party Advisory

Quick Facts

CVE IDCVE-2020-28194
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-191
CISA KEVNo
Affected1 vendor(s)
PublishedFeb 1, 2021

Related CVEs (CWE-191)

CVE-2007-0063
10.0
CVE-2018-20179
9.8
CVE-2015-2311
9.8
CVE-2018-14353
9.8
CVE-2016-1925
9.8
CVE-2018-20180
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-28194 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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