Security readout for executives and security teams
Plain-English summary
If an organization manually deployed two radsecproxy dynamic-discovery example scripts, malicious DNS discovery records could alter generated configuration. That can expose information, disrupt RADIUS service, or redirect authentication traffic to an unauthenticated server. The risk is serious but narrower than a default product flaw because the vulnerable scripts are examples and not automatically installed or updated.
Executive priority
Treat this as high priority for organizations using radsecproxy dynamic discovery in authentication infrastructure. It can affect availability and authentication routing, but exposure is conditional on manually deployed example scripts rather than every radsecproxy installation.
Technical view
CVE-2021-32642 is a CWE-20 input validation failure in naptr-eduroam.sh and radsec-dynsrv.sh. Crafted RadSec peer discovery DNS records can cause configuration injection. The vulnerable code is independent of radsecproxy itself; updated scripts are in master and 1.9 and can be used with any radsecproxy version.
Likely exposure
Most likely exposed are RADIUS or RadSec deployments that manually copied or adapted the vulnerable dynamic discovery example scripts, especially eduroam-style federation discovery. Standard radsecproxy packages are less likely to be exposed if they did not deploy those scripts.
Exploitation context
The bundle does not cite known active exploitation, and CISA KEV status is false. Exploitation is network-reachable but rated high complexity because it depends on crafted peer discovery DNS records affecting a deployment that uses the vulnerable scripts.
Researcher notes
Focus validation on script provenance and operational use, not only radsecproxy package version. The advisory states the scripts are not part of the installation package, are not automatically updated, and work independently of radsecproxy code.
Mitigation direction
- Identify whether naptr-eduroam.sh or radsec-dynsrv.sh are deployed anywhere.
- Replace vulnerable example scripts with the updated versions from radsecproxy master or 1.9.
- Do not assume package updates replaced manually copied example scripts.
- Review vendor and distribution advisories for environment-specific packaging guidance.
- Prioritize changes where dynamic discovery supports external federation or roaming authentication.
Validation and detection
- Search configuration management and hosts for the two script names.
- Confirm deployed script contents match updated radsecproxy examples.
- Check whether RadSec dynamic discovery is enabled in production authentication paths.
- Review DNS trust assumptions for peer discovery records.
- Run the project unit and regression tests after any local remediation change.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-20: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-32642 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H2.24.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7HighVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.usenix.org/conference/usenixsecurity21/presentation/jeitnerCVE reference · x_refsource_MISC
- https://github.com/radsecproxy/radsecproxy/security/advisories/GHSA-56gw-9rj9-55rcCVE reference · x_refsource_CONFIRM
- FEDORA-2021-a4be4c93e4CVE reference · vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-d3f8193065CVE reference · vendor-advisory, x_refsource_FEDORA
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.