Vulnerability Intelligence Report
Cisco NX-OS Software Security Hardening Release: October 2026 - Improper Access Control Vulnerabilities
CVE-2026-76455
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco NX-OS engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-76455 are related to improper access control issues that are grouped under the Common Weakness Enumeration (CWE) CWE-284.
No Active Exploit Signals
CVSS Base Score
9.8
CRITICAL
Exploitability:3.9
Impact Score:5.9
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-284 ↗Improper Access Control
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Cisco | Cisco NX-OS Software | 8.2(5) (affected), 7.3(5)D1(1) (affected), 8.4(2) (affected), 8.4(3) (affected), 9.2(3) (affected), 8.2(1) (affected), 7.3(1)D1(1) (affected), 9.2(2v) (affected), 7.3(0)D1(1) (affected), 7.3(4)D1(1) (affected), 9.2(1) (affected), 9.2(2t) (affected), 9.2(3y) (affected), 9.3(2) (affected), 7.3(1)DY(1) (affected), 8.1(1) (affected), 8.2(2) (affected), 8.3(2) (affected), 7.3(2)D1(3a) (affected), 9.2(4) (affected), 8.1(2) (affected), 7.3(3)D1(1) (affected), 8.2(3) (affected), 8.3(1) (affected), 8.4(1) (affected), 8.1(1b) (affected), 7.3(0)DX(1) (affected), 7.3(2)D1(1) (affected), 9.3(1) (affected), 7.3(2)D1(2) (affected), 8.2(4) (affected), 7.3(0)DY(1) (affected), 9.3(1z) (affected), 9.2(2) (affected), 8.1(2a) (affected), 7.3(2)D1(3) (affected), 8.1(1a) (affected), 8.4(1a) (affected), 9.3(3) (affected), 7.3(2)D1(1d) (affected), 9.3(4) (affected), 7.3(6)D1(1) (affected), 8.2(6) (affected), 9.3(5) (affected), 8.4(2a) (affected), 8.4(2b) (affected), 8.5(1) (affected), 9.3(6) (affected), 8.4(4) (affected), 7.3(7)D1(1) (affected), 8.4(2c) (affected), 9.3(5w) (affected), 8.2(7) (affected), 9.3(7) (affected), 9.3(7k) (affected), 7.3(8)D1(1) (affected), 9.3(7a) (affected), 8.2(7a) (affected), 9.3(8) (affected), 8.4(4a) (affected), 8.4(2d) (affected), 8.4(5) (affected), 8.2(8) (affected), 9.3(9) (affected), 7.3(9)D1(1) (affected), 8.4(6) (affected), 8.4(2e) (affected), 9.3(10) (affected), 9.2(1a) (affected), 8.2(9) (affected), 10.3(1) (affected), 8.4(7) (affected), 10.3(2) (affected), 8.4(6a) (affected), 9.3(11) (affected), 10.3(3) (affected), 9.4(1) (affected), 9.3(2a) (affected), 8.4(2f) (affected), 8.2(10) (affected), 9.3(12) (affected), 10.4(1) (affected), 8.4(8) (affected), 10.3(99w) (affected), 10.3(3w) (affected), 10.3(99x) (affected), 10.3(3o) (affected), 8.4(9) (affected), 10.3(4) (affected), 10.3(3p) (affected), 10.3(4a) (affected), 9.4(1a) (affected), 10.4(2) (affected), 10.3(3q) (affected), 9.3(13) (affected), 8.2(11) (affected), 9.4(2) (affected), 10.3(5) (affected), 10.4(3) (affected), 10.3(3x) (affected), 10.3(4g) (affected), 10.5(1) (affected), 8.4(10) (affected), 9.4(2a) (affected), 10.3(3r) (affected), 10.3(6) (affected), 9.3(14) (affected), 10.4(4) (affected), 10.3(4h) (affected), 10.5(2) (affected), 10.5(1j) (affected), 8.4(11) (affected), 9.4(3) (affected), 10.3(7) (affected), 10.4(5) (affected), 10.5(3) (affected), 9.3(15) (affected), 9.4(3a) (affected), 10.4(4g) (affected), 10.5(4) (affected), 9.4(3b) (affected), 8.4(12) (affected), 10.6(1) (affected), 10.5(3t) (affected), 10.3(8) (affected), 10.4(6) (affected), 10.5(3s) (affected), 10.5(3e) (affected), 9.4(4) (affected), 10.5(3o) (affected), 9.3(16) (affected), 10.6(1s) (affected), 10.6(2) (affected), 10.5(3p) (affected), 9.4(5) (affected), 10.3(9) (affected), 10.6(2s) (affected), 8.4(13) (affected), 10.6(3) (affected), 10.4(7) (affected), 10.5(5) (affected), 9.3(17) (affected), 10.6(2n) (affected), 10.6(3q) (affected), 10.6(3o) (affected), 10.6(3s) (affected) |
| Cisco | Cisco NX-OS System Software in ACI Mode | 15.2(1g) (affected), 15.2(2e) (affected), 15.2(2f) (affected), 15.2(2g) (affected), 15.2(2h) (affected), 15.2(3f) (affected), 15.2(3e) (affected), 15.2(3g) (affected), 15.2(4d) (affected), 15.2(4e) (affected), 15.2(5c) (affected), 15.2(5d) (affected), 16.0(1g) (affected), 15.2(5e) (affected), 15.2(4f) (affected), 15.2(6e) (affected), 15.2(6h) (affected), 16.0(1j) (affected), 15.2(6g) (affected), 15.2(7f) (affected), 15.2(7g) (affected), 16.0(2h) (affected), 15.2(8d) (affected), 16.0(2j) (affected), 15.2(8e) (affected), 16.0(3d) (affected), 16.0(3e) (affected), 15.2(8f) (affected), 15.2(8g) (affected), 15.3(1d) (affected), 15.2(8h) (affected), 16.0(4c) (affected), 15.3(2a) (affected), 15.2(8i) (affected), 16.0(5h) (affected), 15.3(2b) (affected), 16.0(3g) (affected), 16.0(5j) (affected), 15.3(2c) (affected), 16.0(6c) (affected), 15.3(2d) (affected), 16.1(1f) (affected), 16.0(7e) (affected), 16.0(8e) (affected), 15.3(2e) (affected), 16.0(8f) (affected), 16.1(2f) (affected), 16.1(2g) (affected), 15.3(2f) (affected), 16.0(9c) (affected), 16.1(3f) (affected), 16.0(9d) (affected), 16.0(6h) (affected), 16.0(8h) (affected), 16.1(3g) (affected), 16.0(9e) (affected), 16.1(4h) (affected), 16.1(5e) (affected), 16.2(1g) (affected), 16.0(9f) (affected), 16.2(2e) (affected) |
| Cisco | Cisco Unified Computing System (Managed) | 4.0(1a) (affected), 4.1(1d) (affected), 4.0(4f) (affected), 4.0(4c) (affected), 4.0(2b) (affected), 4.1(2a) (affected), 4.0(4a) (affected), 4.0(4e) (affected), 4.0(4h) (affected), 4.0(2a) (affected), 4.1(1c) (affected), 4.0(1b) (affected), 4.1(1e) (affected), 4.0(4d) (affected), 4.0(4b) (affected), 4.0(2e) (affected), 4.1(1a) (affected), 4.0(4g) (affected), 4.0(1d) (affected), 4.0(1c) (affected), 4.0(4i) (affected), 4.0(2d) (affected), 4.1(1b) (affected), 4.1(2b) (affected), 4.0(4k) (affected), 4.1(3a) (affected), 4.1(3b) (affected), 4.1(2c) (affected), 4.0(4l) (affected), 4.1(4a) (affected), 4.1(3c) (affected), 4.1(3d) (affected), 4.2(1c) (affected), 4.2(1d) (affected), 4.0(4m) (affected), 4.1(3e) (affected), 4.2(1f) (affected), 4.1(3f) (affected), 4.2(1i) (affected), 4.1(3h) (affected), 4.2(1k) (affected), 4.2(1l) (affected), 4.0(4n) (affected), 4.2(1m) (affected), 4.1(3i) (affected), 4.2(2a) (affected), 4.2(1n) (affected), 4.1(3j) (affected), 4.2(2c) (affected), 4.2(2d) (affected), 4.2(3b) (affected), 4.1(3k) (affected), 4.0(4o) (affected), 4.2(2e) (affected), 4.2(3d) (affected), 4.2(3e) (affected), 4.2(3g) (affected), 4.1(3l) (affected), 4.3(2b) (affected), 4.2(3h) (affected), 4.2(3i) (affected), 4.3(2c) (affected), 4.1(3m) (affected), 4.3(2e) (affected), 4.3(3a) (affected), 4.2(3j) (affected), 4.3(3c) (affected), 4.3(4a) (affected), 4.2(3k) (affected), 4.3(4b) (affected), 4.3(4c) (affected), 4.2(3l) (affected), 4.3(4d) (affected), 4.3(2f) (affected), 4.2(3m) (affected), 4.3(5a) (affected), 4.3(4e) (affected), 4.1(3n) (affected), 4.3(4f) (affected), 4.2(3n) (affected), 4.3(5c) (affected), 4.2(3o) (affected), 4.3(5d) (affected), 4.3(6a) (affected), 4.3(6b) (affected), 4.3(5e) (affected), 4.3(6c) (affected), 4.2(3p) (affected), 6.0(1b) (affected), 6.0(1c) (affected), 4.3(6d) (affected), 6.0(1d) (affected), 6.0(1e) (affected), 4.3(6e) (affected), 6.0(1f) (affected), 4.3(6f) (affected), 6.0(2b) (affected), 6.0(1h) (affected), 4.2(3r) (affected), 6.0(2c) (affected), 4.3(6g) (affected), 6.0(2d) (affected), 4.3(6h) (affected), 4.2(3s) (affected), 4.3(6i) (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Cisco Systems, Inc. · Hosted Service · USA |
| Reserved | 2026-08-19T12:02:03 |
| Published | 2026-10-07T16:15:27 |
| Last Updated | 2026-10-08T03:55:52 |
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