CVE-2026-76455
Cisco NX-OS Software Security Hardening Release: October 2026 - Improper Access Control Vulnerabilities
CVSS Score
9.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-284 |
| Vendor | cisco |
| Product | cisco nx-os software |
| Ecosystems | |
| Industries | NetworkingTelecommunications |
| Published | Oct 7, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
Cisco / Cisco NX-OS Software
8.2(5) 7.3(5)D1(1) 8.4(2) 8.4(3) 9.2(3) 8.2(1) 7.3(1)D1(1) 9.2(2v) 7.3(0)D1(1) 7.3(4)D1(1) 9.2(1) 9.2(2t) 9.2(3y) 9.3(2) 7.3(1)DY(1) 8.1(1) 8.2(2) 8.3(2) 7.3(2)D1(3a) 9.2(4) 8.1(2) 7.3(3)D1(1) 8.2(3) 8.3(1) 8.4(1) 8.1(1b) 7.3(0)DX(1) 7.3(2)D1(1) 9.3(1) 7.3(2)D1(2) 8.2(4) 7.3(0)DY(1) 9.3(1z) 9.2(2) 8.1(2a) 7.3(2)D1(3) 8.1(1a) 8.4(1a) 9.3(3) 7.3(2)D1(1d) 9.3(4) 7.3(6)D1(1) 8.2(6) 9.3(5) 8.4(2a) 8.4(2b) 8.5(1) 9.3(6) 8.4(4) 7.3(7)D1(1) 8.4(2c) 9.3(5w) 8.2(7) 9.3(7) 9.3(7k) 7.3(8)D1(1) 9.3(7a) 8.2(7a) 9.3(8) 8.4(4a) 8.4(2d) 8.4(5) 8.2(8) 9.3(9) 7.3(9)D1(1) 8.4(6) 8.4(2e) 9.3(10) 9.2(1a) 8.2(9) 10.3(1) 8.4(7) 10.3(2) 8.4(6a) 9.3(11) 10.3(3) 9.4(1) 9.3(2a) 8.4(2f) 8.2(10) 9.3(12) 10.4(1) 8.4(8) 10.3(99w) 10.3(3w) 10.3(99x) 10.3(3o) 8.4(9) 10.3(4) 10.3(3p) 10.3(4a) 9.4(1a) 10.4(2) 10.3(3q) 9.3(13) 8.2(11) 9.4(2) 10.3(5) 10.4(3) 10.3(3x) 10.3(4g) 10.5(1) 8.4(10) 9.4(2a) 10.3(3r) 10.3(6) 9.3(14) 10.4(4) 10.3(4h) 10.5(2) 10.5(1j) 8.4(11) 9.4(3) 10.3(7) 10.4(5) 10.5(3) 9.3(15) 9.4(3a) 10.4(4g) 10.5(4) 9.4(3b) 8.4(12) 10.6(1) 10.5(3t) 10.3(8) 10.4(6) 10.5(3s) 10.5(3e) 9.4(4) 10.5(3o) 9.3(16) 10.6(1s) 10.6(2) 10.5(3p) 9.4(5) 10.3(9) 10.6(2s) 8.4(13) 10.6(3) 10.4(7) 10.5(5) 9.3(17) 10.6(2n) 10.6(3q) 10.6(3o) 10.6(3s)
Cisco / Cisco NX-OS System Software in ACI Mode
15.2(1g) 15.2(2e) 15.2(2f) 15.2(2g) 15.2(2h) 15.2(3f) 15.2(3e) 15.2(3g) 15.2(4d) 15.2(4e) 15.2(5c) 15.2(5d) 16.0(1g) 15.2(5e) 15.2(4f) 15.2(6e) 15.2(6h) 16.0(1j) 15.2(6g) 15.2(7f) 15.2(7g) 16.0(2h) 15.2(8d) 16.0(2j) 15.2(8e) 16.0(3d) 16.0(3e) 15.2(8f) 15.2(8g) 15.3(1d) 15.2(8h) 16.0(4c) 15.3(2a) 15.2(8i) 16.0(5h) 15.3(2b) 16.0(3g) 16.0(5j) 15.3(2c) 16.0(6c) 15.3(2d) 16.1(1f) 16.0(7e) 16.0(8e) 15.3(2e) 16.0(8f) 16.1(2f) 16.1(2g) 15.3(2f) 16.0(9c) 16.1(3f) 16.0(9d) 16.0(6h) 16.0(8h) 16.1(3g) 16.0(9e) 16.1(4h) 16.1(5e) 16.2(1g) 16.0(9f) 16.2(2e)
Cisco / Cisco Unified Computing System (Managed)
4.0(1a) 4.1(1d) 4.0(4f) 4.0(4c) 4.0(2b) 4.1(2a) 4.0(4a) 4.0(4e) 4.0(4h) 4.0(2a) 4.1(1c) 4.0(1b) 4.1(1e) 4.0(4d) 4.0(4b) 4.0(2e) 4.1(1a) 4.0(4g) 4.0(1d) 4.0(1c) 4.0(4i) 4.0(2d) 4.1(1b) 4.1(2b) 4.0(4k) 4.1(3a) 4.1(3b) 4.1(2c) 4.0(4l) 4.1(4a) 4.1(3c) 4.1(3d) 4.2(1c) 4.2(1d) 4.0(4m) 4.1(3e) 4.2(1f) 4.1(3f) 4.2(1i) 4.1(3h) 4.2(1k) 4.2(1l) 4.0(4n) 4.2(1m) 4.1(3i) 4.2(2a) 4.2(1n) 4.1(3j) 4.2(2c) 4.2(2d) 4.2(3b) 4.1(3k) 4.0(4o) 4.2(2e) 4.2(3d) 4.2(3e) 4.2(3g) 4.1(3l) 4.3(2b) 4.2(3h) 4.2(3i) 4.3(2c) 4.1(3m) 4.3(2e) 4.3(3a) 4.2(3j) 4.3(3c) 4.3(4a) 4.2(3k) 4.3(4b) 4.3(4c) 4.2(3l) 4.3(4d) 4.3(2f) 4.2(3m) 4.3(5a) 4.3(4e) 4.1(3n) 4.3(4f) 4.2(3n) 4.3(5c) 4.2(3o) 4.3(5d) 4.3(6a) 4.3(6b) 4.3(5e) 4.3(6c) 4.2(3p) 6.0(1b) 6.0(1c) 4.3(6d) 6.0(1d) 6.0(1e) 4.3(6e) 6.0(1f) 4.3(6f) 6.0(2b) 6.0(1h) 4.2(3r) 6.0(2c) 4.3(6g) 6.0(2d) 4.3(6h) 4.2(3s) 4.3(6i)