CVE-2026-76492 - Vulnerability Details

- Cisco Expressway Series Software Hardening Release: October 2026 - NULL Pointer Vulnerabilities

Description

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Expressway Series software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities.  

The vulnerabilities tracked by CVE-2026-76492 are related to issues concerning null pointers that are grouped under the Common Weakness Enumeration (CWE) Base CWE-476.

Published: 2026-10-21

Score: 7.5 High

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Impact

The vulnerability in Cisco Expressway Series software involves null pointer dereference issues that can cause the application to terminate unexpectedly or behave unpredictably. Classified as CWE-476, this flaw generally results in a crash or disruption of service rather than direct compromise of confidentiality or integrity.

Affected Systems

Cisco TelePresence Video Communication Server (VCS) Expressway. No specific patch versions or affected releases are listed in the data, so all iterations of the Expressway product are presumed vulnerable until a vendor update is applied.

Risk and Exploitability

This flaw has a CVSS score of 7.5, indicating high severity. The EPSS score is not available, and the vulnerability is not listed in the CISA KEV catalog. Because the Expressway server is a network‑reachable service, it is reasonable to infer that exploitation could be attempted remotely by sending a specially crafted request that triggers a null pointer dereference. The lack of a KEV listing and EPSS value suggests that public exploitation has not yet been observed, but the high CVSS score warrants a proactive response.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Cisco

Cisco TelePresence Video Communication Server (VCS) Expressway

unknown

Version	Status	Constraints
`X8.11.2`	affected	—
`X8.6`	affected	—
`X8.11.3`	affected	—
`X8.2.2`	affected	—
`X8.8.3`	affected	—
`X8.11.0`	affected	—
`X12.5.2`	affected	—
`X8.1.1`	affected	—
`X8.9`	affected	—
`X12.5.1`	affected	—
`X12.5.6`	affected	—
`X8.7.3`	affected	—
`X12.6.0`	affected	—
`X8.11.1`	affected	—
`X8.5`	affected	—
`X8.9.1`	affected	—
`X8.10.2`	affected	—
`X8.8.2`	affected	—
`X8.5.3`	affected	—
`X8.1`	affected	—
`X8.9.2`	affected	—
`X8.11.4`	affected	—
`X12.5.4`	affected	—
`X8.8.1`	affected	—
`X8.2.1`	affected	—
`X8.5.1`	affected	—
`X8.6.1`	affected	—
`X8.1.2`	affected	—
`X8.8`	affected	—
`X8.10.0`	affected	—
`X12.5.3`	affected	—
`X8.10.1`	affected	—
`X12.5.7`	affected	—
`X8.10.3`	affected	—
`X8.7.1`	affected	—
`X8.2`	affected	—
`X12.5.8`	affected	—
`X8.7`	affected	—
`X8.5.2`	affected	—
`X12.5.9`	affected	—
`X12.5.0`	affected	—
`X8.10.4`	affected	—
`X8.7.2`	affected	—
`X12.5.5`	affected	—
`X12.6.1`	affected	—
`X12.6.2`	affected	—
`X12.6.3`	affected	—
`X12.6.4`	affected	—
`X12.7.0`	affected	—
`X12.7.1`	affected	—
`X14.0.0`	affected	—
`X14.0.1`	affected	—
`X14.0.2`	affected	—
`X14.0.3`	affected	—
`X14.0.4`	affected	—
`X14.0.5`	affected	—
`X14.0.6`	affected	—
`X14.0.7`	affected	—
`X14.0.8`	affected	—
`X14.2.0`	affected	—
`X14.0.9`	affected	—
`X14.2.1`	affected	—
`X14.2.2`	affected	—
`X14.0.11`	affected	—
`X14.2.5`	affected	—
`X14.0.10`	affected	—
`X14.2.6`	affected	—
`X14.2.7`	affected	—
`X14.3.0`	affected	—
`X14.3.1`	affected	—
`X14.3.2`	affected	—
`X14.3.3`	affected	—
`X15.0.0`	affected	—
`X14.3.4`	affected	—
`X14.3.5`	affected	—
`X15.0.1`	affected	—
`X15.0.2`	affected	—
`X15.0.3`	affected	—
`X14.3.6`	affected	—
`X15.2.0`	affected	—
`X15.2.1`	affected	—
`X15.2.2`	affected	—
`X15.2.3`	affected	—
`X14.3.7`	affected	—
`X15.2.4.`	affected	—
`X15.2.4`	affected	—
`X15.3.0`	affected	—
`X15.3.1`	affected	—
`X15.3.2`	affected	—
`X15.4.0`	affected	—
`X15.5.0`	affected	—
`X15.5.1`	affected	—
`X15.5.2`	affected	—
`X15.5.3`	affected	—

No data.

Vendor Product Confidence Versions

Cisco

Expressway Series

100%

Version	Status	Scheme	Platform
`[X8.11.2,X8.11.2]`	affected	generic	—
`[X8.6,X8.6]`	affected	generic	—
`[X8.11.3,X8.11.3]`	affected	generic	—
`[X8.2.2,X8.2.2]`	affected	generic	—
`[X8.8.3,X8.8.3]`	affected	generic	—
`[X8.11.0,X8.11.0]`	affected	generic	—
`[X12.5.2,X12.5.2]`	affected	generic	—
`[X8.1.1,X8.1.1]`	affected	generic	—
`[X8.9,X8.9]`	affected	generic	—
`[X12.5.1,X12.5.1]`	affected	generic	—
`[X12.5.6,X12.5.6]`	affected	generic	—
`[X8.7.3,X8.7.3]`	affected	generic	—
`[X12.6.0,X12.6.0]`	affected	generic	—
`[X8.11.1,X8.11.1]`	affected	generic	—
`[X8.5,X8.5]`	affected	generic	—
`[X8.9.1,X8.9.1]`	affected	generic	—
`[X8.10.2,X8.10.2]`	affected	generic	—
`[X8.8.2,X8.8.2]`	affected	generic	—
`[X8.5.3,X8.5.3]`	affected	generic	—
`[X8.1,X8.1]`	affected	generic	—
`[X8.9.2,X8.9.2]`	affected	generic	—
`[X8.11.4,X8.11.4]`	affected	generic	—
`[X12.5.4,X12.5.4]`	affected	generic	—
`[X8.8.1,X8.8.1]`	affected	generic	—
`[X8.2.1,X8.2.1]`	affected	generic	—
`[X8.5.1,X8.5.1]`	affected	generic	—
`[X8.6.1,X8.6.1]`	affected	generic	—
`[X8.1.2,X8.1.2]`	affected	generic	—
`[X8.8,X8.8]`	affected	generic	—
`[X8.10.0,X8.10.0]`	affected	generic	—
`[X12.5.3,X12.5.3]`	affected	generic	—
`[X8.10.1,X8.10.1]`	affected	generic	—
`[X12.5.7,X12.5.7]`	affected	generic	—
`[X8.10.3,X8.10.3]`	affected	generic	—
`[X8.7.1,X8.7.1]`	affected	generic	—
`[X8.2,X8.2]`	affected	generic	—
`[X12.5.8,X12.5.8]`	affected	generic	—
`[X8.7,X8.7]`	affected	generic	—
`[X8.5.2,X8.5.2]`	affected	generic	—
`[X12.5.9,X12.5.9]`	affected	generic	—
`[X12.5.0,X12.5.0]`	affected	generic	—
`[X8.10.4,X8.10.4]`	affected	generic	—
`[X8.7.2,X8.7.2]`	affected	generic	—
`[X12.5.5,X12.5.5]`	affected	generic	—
`[X12.6.1,X12.6.1]`	affected	generic	—
`[X12.6.2,X12.6.2]`	affected	generic	—
`[X12.6.3,X12.6.3]`	affected	generic	—
`[X12.6.4,X12.6.4]`	affected	generic	—
`[X12.7.0,X12.7.0]`	affected	generic	—
`[X12.7.1,X12.7.1]`	affected	generic	—
`[X14.0.0,X14.0.0]`	affected	generic	—
`[X14.0.1,X14.0.1]`	affected	generic	—
`[X14.0.2,X14.0.2]`	affected	generic	—
`[X14.0.3,X14.0.3]`	affected	generic	—
`[X14.0.4,X14.0.4]`	affected	generic	—
`[X14.0.5,X14.0.5]`	affected	generic	—
`[X14.0.6,X14.0.6]`	affected	generic	—
`[X14.0.7,X14.0.7]`	affected	generic	—
`[X14.0.8,X14.0.8]`	affected	generic	—
`[X14.2.0,X14.2.0]`	affected	generic	—
`[X14.0.9,X14.0.9]`	affected	generic	—
`[X14.2.1,X14.2.1]`	affected	generic	—
`[X14.2.2,X14.2.2]`	affected	generic	—
`[X14.0.11,X14.0.11]`	affected	generic	—
`[X14.2.5,X14.2.5]`	affected	generic	—
`[X14.0.10,X14.0.10]`	affected	generic	—
`[X14.2.6,X14.2.6]`	affected	generic	—
`[X14.2.7,X14.2.7]`	affected	generic	—
`[X14.3.0,X14.3.0]`	affected	generic	—
`[X14.3.1,X14.3.1]`	affected	generic	—
`[X14.3.2,X14.3.2]`	affected	generic	—
`[X14.3.3,X14.3.3]`	affected	generic	—
`[X15.0.0,X15.0.0]`	affected	generic	—
`[X14.3.4,X14.3.4]`	affected	generic	—
`[X14.3.5,X14.3.5]`	affected	generic	—
`[X15.0.1,X15.0.1]`	affected	generic	—
`[X15.0.2,X15.0.2]`	affected	generic	—
`[X15.0.3,X15.0.3]`	affected	generic	—
`[X14.3.6,X14.3.6]`	affected	generic	—
`[X15.2.0,X15.2.0]`	affected	generic	—
`[X15.2.1,X15.2.1]`	affected	generic	—
`[X15.2.2,X15.2.2]`	affected	generic	—
`[X15.2.3,X15.2.3]`	affected	generic	—
`[X14.3.7,X14.3.7]`	affected	generic	—
`[X15.2.4.,X15.2.4.]`	affected	generic	—
`[X15.2.4,X15.2.4]`	affected	generic	—
`[X15.3.0,X15.3.0]`	affected	generic	—
`[X15.3.1,X15.3.1]`	affected	generic	—
`[X15.3.2,X15.3.2]`	affected	generic	—
`[X15.4.0,X15.4.0]`	affected	generic	—
`[X15.5.0,X15.5.0]`	affected	generic	—
`[X15.5.1,X15.5.1]`	affected	generic	—
`[X15.5.2,X15.5.2]`	affected	generic	—
`[X15.5.3,X15.5.3]`	affected	generic	—

Found an issue or want to improve our Enrichment? You can suggest it directly by opening an issue on our dedicated GitHub repository .

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Apply the Cisco Expressway Series software hardening release for October 2026 to address the null pointer vulnerabilities.
Deploy the updated firmware or software across all Cisco Expressway servers in the environment.
Restrict inbound traffic to the Expressway ports until all systems have been patched to reduce exposure to accidental crashes.

Generated by OpenCVE AI on October 22, 2026 at 04:59 UTC.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00367.

Exploitation none

Automatable yes

Technical Impact partial

References

Link	Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-exwy-hardening-FhcqBVcs
https://www.cve.org/Media/News/item/blog/2026/06/16/Preserving-Vulnerability-Level-Identification

History

Sat, 07 Nov 2026 18:30:00 +0000

Type	Values Removed	Values Added
References		https://www.cve.org/Media/News/item/blog/2026/06/16/Preserving-Vulnerability-Level-Identification

Thu, 22 Oct 2026 14:30:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Thu, 22 Oct 2026 11:00:00 +0000

Type	Values Removed	Values Added
First Time appeared		Cisco Cisco expressway Series
Vendors & Products		Cisco Cisco expressway Series

Wed, 21 Oct 2026 17:15:00 +0000

Type	Values Removed	Values Added
Description		As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Expressway Series software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities.   The vulnerabilities tracked by CVE-2026-76492 are related to issues concerning null pointers that are grouped under the Common Weakness Enumeration (CWE) Base CWE-476.
Title		Cisco Expressway Series Software Hardening Release: October 2026 - NULL Pointer Vulnerabilities
Weaknesses		CWE-476
References		https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-exwy-hardening-FhcqBVcs
Metrics		cvssV3_1 `{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}`

Subscriptions

Cisco Expressway Series

MITRE

Status: PUBLISHED

Assigner: cisco

Published: 2026-10-21T16:17:14.565Z

Updated: 2026-11-07T17:29:43.580Z

Reserved: 2026-08-19T12:02:03.640Z

Link: CVE-2026-76492

Vulnrichment

Updated: 2026-11-07T17:29:43.580Z

NVD

Status : Awaiting Analysis

Published: 2026-10-21T17:19:08.620

Modified: 2026-11-07T18:17:28.140

Link: CVE-2026-76492

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-10-22T10:41:05Z

Weaknesses

CWE-476
NULL Pointer Dereference

Impact

Affected Systems

Risk and Exploitability

Tracking

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

Exploitation none

Automatable yes

Technical Impact partial

Subscriptions

JSON object

JSON object

JSON object

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