CVE-2026-76466 (GCVE-0-2026-76466)
Vulnerability from cvelistv5 – Published: 2026-10-21 16:14 – Updated: 2026-10-21 17:19
VLAI
EPSS
VEX
Title
Cisco Expressway Series Remote Code Execution Vulnerability
Summary
A vulnerability in the database service feature of Cisco Expressway Series could allow an unauthenticated, remote attacker with network access to a Cisco Expressway device to execute arbitrary operating system commands as root.
This vulnerability is due to the use of persistent cookies. Additionally, there is insufficient validation of client certificates when the TLS Verify Mode is set to Enabled for clustering, which means that client certificates are not validated. An attacker with possession of the cookies could exploit this vulnerability by connecting to the database service and invoking specific remote procedure call (RPC) commands. A successful exploit could allow the attacker to execute arbitrary commands as root on the underlying operating system of an affected device.
Note: Cisco Expressway Series refers to Cisco Expressway Core (Expressway-C) devices and Cisco Expressway Edge (Expressway-E) devices.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-21 16:48 UTC
CWE
- CWE-798 - Use of Hard-coded Credentials
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway |
Affected:
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 |
guessed |
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"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 5.9,
"source": "psirt@cisco.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-76466",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-21T16:48:49.979581Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-10-21T17:19:06.813",
"references": [
{
"source": "psirt@cisco.com",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-vcs-static-cred-hr7EWZ8t"
}
],
"sourceIdentifier": "psirt@cisco.com",
"vulnStatus": "Awaiting Analysis",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-798"
}
],
"source": "psirt@cisco.com",
"type": "Secondary"
}
]
}
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.