CVE-2026-76464: Cisco Meraki Hardening Release October 2026 - Buffer Management Vulnerabilities
- Is it exploited?
Not on CISA's list. CISA has not added it to the Known Exploited Vulnerabilities catalog as of . If CISA adds it, this page shows it as known exploited.
- How likely is exploitation in the next 30 days?
- 0.2%
EPSS score, percentile 8.9 of all scored records. A probability estimated by FIRST, not a report of exploitation.
- How severe?
- 9.6 Critical
CVSS v3.1 base score, given by the CNA
- What should I do?
CISA has set no required action, because the vulnerability is not in KEV.
The CVE record links no vendor advisory, patch or mitigation.
- Which versions are affected?
Affected
- CG 33.1.3
- MR 33.1.2
- MR 30.6
- MR 32.1.7
- MR 32.2.3
- MR 32.2.4
and 25 more in the table below
Source: CISA KEV 2026.10.29, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.
What to do
Advisories and patches
The CVE record links no vendor advisory, patch or mitigation.
This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.
Affected products and versions
As listed in the CVE record.
| Status | Versions |
|---|---|
| Affected | CG 33.1.3 |
Versions not listed are: unknown.
| Status | Versions |
|---|---|
| Affected | MR 33.1.2 |
| Affected | MR 30.6 |
| Affected | MR 32.1.7 |
| Affected | MR 32.2.3 |
| Affected | MR 32.2.4 |
| Affected | MR 33.1.1 |
Versions not listed are: unknown.
| Status | Versions |
|---|---|
| Affected | 4.20 |
| Affected | 5.0 |
| Affected | 5.1 |
| Affected | 5.2 |
| Affected | 5.3 |
| Affected | 5.4 |
| Affected | 5.4.1 |
| Affected | 5.5 |
| Affected | 5.5.1 |
| Affected | 5.6 |
| Affected | 5.6.1 |
| Affected | 6.0 |
Versions not listed are: unknown.
And 77 more version entries in the CVE record.
| Status | Versions |
|---|---|
| Affected | 16.2 |
| Affected | 16.3 |
| Affected | 16.4 |
| Affected | 16.5 |
| Affected | 16.6 |
| Affected | 17.3 |
| Affected | 17.6 |
| Affected | 17.7 |
| Affected | 17.8 |
| Affected | 17.9 |
| Affected | 17.10 |
| Affected | 18.1 |
Versions not listed are: unknown.
And 9 more version entries in the CVE record.
Source: CVE List, as of . About the data.
About this vulnerability
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco networking 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 this CVE-2026-76464 are related to buffer management issues that are group…
Summary: CVE record, as of .
- CISA has not added CVE-2026-76464 to its Known Exploited Vulnerabilities (KEV) catalog, as of 29 Oct 2026.
- The CVE record was published on 7 Oct 2026.
- The CVE record carries a CVSS v3.1 base score of 9.6 (Critical), given by its CNA.
- FIRST's EPSS model puts the probability of exploitation in the next 30 days at 0.2% (percentile 8.9), as of 29 Oct 2026. EPSS is a statistical estimate, not a report of exploitation.
- CISA's SSVC assessment in the CVE record: exploitation none, automatable no, technical impact total.
Source: CISA KEV 2026.10.29, as of ; CVE List, as of ; FIRST EPSS, as of . About the data.
Description
Cisco Meraki Hardening Release October 2026 - Buffer Management Vulnerabilities
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco networking 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 this CVE-2026-76464 are related to buffer management issues that are grouped under the Common Weakness Enumeration (CWE) CWE-119.
Source: CVE List, as of . About the data.
Weakness
CWE-119
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.
Timeline
| Date | Event |
|---|---|
| CVE record published | |
| CVE record last updated |
References
1
Known exploited Cisco vulnerabilities
- CVE-2026-76418: Cisco Secure Firewall ASA Software and Cisco Secure FTD Software Unchecked Return Value to NULL Pointer Dereference Vulnerability
- CVE-2026-76519: Cisco Secure Email Gateway Relative Path Traversal Vulnerability
- CVE-2026-76504: Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability
- CVE-2026-76460: Cisco Identity Services Engine Incorrect Use of Privileged APIs Vulnerability
- CVE-2026-76461: Cisco Secure Email Gateway SQL Injection Vulnerability