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TI-2026-73508 Aliases CVE-2026-78633GHSA-389c-65cx-g77r

Denial of service in Okta RADIUS Agent packet parser

Priority LOW 28CWE-835Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-835.

Summary

The Okta RADIUS Agent from 2.17.5 before 2.28.0 does not validate the sub-attribute length when parsing a Vendor-Specific attribute. A sub-attribute length of zero makes the parser loop indefinitely, which exhausts worker threads and blocks new RADIUS authentication requests. An unauthenticated remote attacker on the network can cause this denial of service.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

The Okta RADIUS Agent does not validate the sub-attribute length when parsing a Vendor-Specific attribute. A sub-attribute length of zero causes the parser to loop indefinitely, resulting in worker-thread exhaustion and denial of new RADIUS authentication requests.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00208 10th percentileScored 2026-11-07
Fix Fixed Okta RADIUS Agent (Okta): 2.28.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
OktaOkta RADIUS Agent2.17.5 to before 2.28.02.28.0Patch availableCNA
  • Okta RADIUS Agent VendorOkta Affected 2.17.5 to before 2.28.0 Fixed in 2.28.0 Patch available CNA

Remediation

Update Okta RADIUS Agent to version 2.28.0.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA Okta RADIUS Agent (Okta) Fixed in 2.28.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Okta RADIUS Agent 2.28.0

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2026-73507 Insecure default file permissions in Okta RADIUS Agent Windows installerPriority LOW 22
    Show all 2 records →

Timeline

  1. 2026-10-13 Threatist record created from CVE-2026-78633
  2. 2026-10-13 Alias added: GHSA-389c-65cx-g77r
  3. 2026-10-14 Priority changed: MEDIUM → LOW
  4. 2026-10-16 CISA SSVC decision points changed

References

Other 1

  • TI-2021-20426 Imprivata Privileged Access Management (formally Xton Privileged Access Management) 2.3.202112051108 allows XSS. CVSS 3.1MEDIUM 5.4
  • TI-2022-08176 Code injection in Okta Advanced Server Access Client CVSS 3.1HIGH 8.8
  • TI-2021-09349 A command injection vulnerability in the cookieDomain and relayDomain parameters of Okta… CVSS 3.1MEDIUM 6.7
  • TI-2026-54670 Improper Handling of SAML Assertion Attributes in Okta Access Gateway Advanced Mode Datastores CVSS 3.1CRITICAL 9.9
  • TI-2026-79552 Command execution via Admin Console input in Okta Access Gateway CVSS 3.1CRITICAL 9.1
  • TI-2023-00089 Command injection in Okta Advanced Server Access CVSS 3.1HIGH 8.8
See all 39 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences