CVE-2026-77709: pre-authentication heap-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
CVE-2026-77709: pre-authentication heap-based buffer overflow vulnerability has been identified in the SonicOS TACACS+ authentication client, which in…
Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.
CVE-2026-77709 key facts
- CISA KEV
- Not listed (catalog checked )
- Highest advisory severity
- High
- Vendor advisories
- 2 from SonicWall
- VulniPulse record
- Published · Updated
Is CVE-2026-77709 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-77709 is not in the CISA KEV catalog (checked ) and no tracked advisory for it reports exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-77709?
- A pre-authentication heap-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. (SonicWall)
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Vendor advisory comparison
SonicWall
2 advisories- Advisory severityHigh8.8
High [CVE-2026-107154 +6] SonicOS: session validation vulnerability has been identified in the SonicOS management interface, which in specific conditions could…
SNWLID-2026-0014Source published Source updated
This bulletin covers 7 CVEs. The products, versions, score and guidance below describe the bulletin; check its source for applicability to this specific CVE.
A session validation vulnerability has been identified in the SonicOS management interface, which in specific conditions could potentially enable a remote unauthenticated attacker to perform unauthorized operations. Affected products named by the advisory: SSL-VPN.
- Related products — impact not confirmed
- SonicOS
- SSL-VPN
- Source-reported affected versions
- Affected-version details not available in this record.
- Source-reported fixed versions
- No fixed-version detail extracted. This does not mean no fix exists.
- Mitigation guidance
- A session validation vulnerability has been identified in the SonicOS management interface, which in specific conditions could potentially enable a remote unauthenticated attacker to perform unauthorized operations.
- Advisory severityUnrated
Advisory [CVE-2026-77709] pre-authentication heap-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
CVE-2026-77709Source published Source updated
A pre-authentication heap-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.
- Affected products in this advisory
- SonicOS
- Source-reported affected versions
- SonicOS 7.3.3-7015 and older versions
- SonicOS 8.2.2-8015 and older versions
- Source-reported fixed versions
- No fixed-version detail extracted. This does not mean no fix exists.
- Mitigation guidance
- A pre-authentication heap-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.
More SonicWall advisories
- CVE-2026-19703Nov 6, 2026weak password hashing vulnerability has been identified on SonicOS virtual appliances
- CVE-2026-77709Nov 6, 2026pre-authentication heap-based buffer overflow vulnerability has been identified
- CVE-2026-77708Nov 6, 2026pre-authentication stack-based buffer overflow vulnerability has been identified
- CVE-2026-19868Nov 6, 2026authentication enforcement vulnerability in SonicOS SSLVPN service may allow a user
- CVE-2026-82308Nov 6, 2026pre-authentication heap-based buffer overflow vulnerability has been identified
- CVE-2026-107154Nov 6, 2026session validation vulnerability has been identified in the SonicOS management interface
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