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TI-2026-86083 Aliases CVE-2026-77708GHSA-m38j-ghf8-m69h

Stack-based buffer overflow in SonicWall SonicOS TACACS+ client

Priority LOW 27CWE-121Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-121 and the CVSS impact.

Summary

SonicWall SonicOS 7.3.3-7015 and older versions and 8.2.2-8015 and older versions contain a pre-authentication stack-based buffer overflow in the TACACS+ authentication client. Under specific conditions, a remote unauthenticated attacker can trigger it to cause an application-level denial of service. The flaw is classified as CWE-121.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

A pre-authentication stack-based buffer overflow vulnerability has been identified in the SonicOS TACACS+ authentication client, which in specific conditions could potentially enable a remote unauthenticated attacker to cause an application level denial of service.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00659 51st percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

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
SonicWallSonicOS7.3.3-7015 and older versions; 8.2.2-8015 and older versions—No fix listedCNA
  • SonicOS VendorSonicWall Affected 7.3.3-7015 and older versions; 8.2.2-8015 and older versions Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:*——SonicWall
  • cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:* Versions — — ·SonicWall

Remediation

The sources list no fixed version for SonicOS.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Fixed in the same release

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

  • Advisory ·

    SonicWall SonicOS — psirt.global.sonicwall.com/vuln-detail/SNWLID-2026-0014

    7 records Highest priority Priority CRITICAL 1 CRITICAL, 3 MEDIUM, 3 LOW

    Other records, highest priority first

    • TI-2026-86082 SAML authentication bypass in SonicWall SonicOS SSLVPN servicePriority CRITICAL 90
    • TI-2026-86074 Permissive cross-domain policy in SonicWall SonicOS managementPriority MEDIUM 41
    • TI-2026-86073 Session validation flaw in SonicWall SonicOS management interfacePriority MEDIUM 41
    Show all 7 records → Advisory →

Timeline

  1. 2026-11-06 Threatist record created from CVE-2026-77708
  2. 2026-11-06 CVSS score added · CISA ADP
  3. 2026-11-06 CISA SSVC decision points changed
  4. 2026-11-06 Alias added: GHSA-m38j-ghf8-m69h

References

Advisory 1

  • TI-2026-57684 Server-side request forgery in SonicWall SMA1000 KEVCVSS 3.1CRITICAL 10.0
  • TI-2026-12965 Server-side request forgery in SonicWall SMA1000 KEVCVSS 3.1CRITICAL 10.0
  • TI-2025-16819 Deserialization of untrusted data in SonicWall SMA1000 KEVCVSS 3.1CRITICAL 9.8
  • TI-2021-19919 Apache Log4j2 JNDI features do not protect against attacker controlled LDAP and other JNDI related endpoints KEVCVSS 3.1CRITICAL 10.0
  • TI-2021-03356 Stack-based buffer overflow in SonicWall SMA100 KEVCVSS 3.1CRITICAL 9.8
  • TI-2021-03349 SQL injection in SonicWall SRA/SMA100 KEVCVSS 3.1CRITICAL 9.8
See all 283 →

Sources

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