CVE-2021-32642Network attack vector

Configuration injection via unvalidated DNS records

Published May 28, 2021 · Updated Aug 3, 2024

Improper input validation in radsecproxy before 1.9.0 allows remote attackers to inject configuration via crafted DNS peer records. The naptr-eduroam.sh and radsec-dynsrv.sh example scripts copy DNS NAPTR and SRV host and port fields into generated server blocks without validating them, allowing configuration injection. Exploitation requires deployment of these optional scripts with attacker-controlled peer-discovery DNS data and can disclose information, interrupt service, or redirect RADIUS traffic to an unauthenticated server.

CVSS severity9.4
Critical
EPSS probability1.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper input validation in radsecproxy before 1.9.0 allows remote attackers to inject configuration via crafted DNS peer records. The naptr-eduroam.sh and radsec-dynsrv.sh example scripts copy DNS NAPTR and SRV host and port fields into generated server blocks without validating them, allowing configuration injection. Exploitation requires deployment of these optional scripts with attacker-controlled peer-discovery DNS data and can disclose information, interrupt service, or redirect RADIUS traffic to an unauthenticated server.

The record

CVE
CVE-2021-32642
Published
May 28, 2021
Updated
Aug 3, 2024
Vendor
radsecproxy
Product
radsecproxy
Classifications
CWE-20, CWE-74, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 28, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.9.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

radsecproxy · radsecproxyversion=< 1.9.0

Published CVSS scores

7.5NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
7.0GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
9.4NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo