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CVE-2021-3048— PAN-OS: Invalid URLs in an External Dynamic List (EDL) can Lead to Firewall Outage

Quick assessment

Affected
Palo Alto Networks PAN-OS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Palo Alto Networks PAN-OS是美国Palo Alto Networks公司的一套为其防火墙设备开发的操作系统。 Palo Alto Networks PAN-OS 存在安全漏洞，该漏洞源于外部动态列表 (EDL) 中包含的某些无效 URL 条目会导致设备服务器守护程序 (devsrvr) 停止响应。

CVSS 5.9 · Medium EPSS 0.84% · P57

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2021-3048

Vulnerability Information
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Vulnerability Title
PAN-OS: Invalid URLs in an External Dynamic List (EDL) can Lead to Firewall Outage
Source: CVE Program / CVE List V5
Vulnerability Description
Certain invalid URL entries contained in an External Dynamic List (EDL) cause the Device Server daemon (devsrvr) to stop responding. This condition causes subsequent commits on the firewall to fail and prevents administrators from performing commits and configuration changes even though the firewall remains otherwise functional. If the firewall then restarts, it results in a denial-of-service (DoS) condition and the firewall stops processing traffic. This issue impacts: PAN-OS 9.0 versions earlier than PAN-OS 9.0.14; PAN-OS 9.1 versions earlier than PAN-OS 9.1.9; PAN-OS 10.0 versions earlier than PAN-OS 10.0.5. PAN-OS 8.1 and PAN-OS 10.1 versions are not impacted.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Palo Alto Networks PAN-OS 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Palo Alto Networks PAN-OS是美国Palo Alto Networks公司的一套为其防火墙设备开发的操作系统。 Palo Alto Networks PAN-OS 存在安全漏洞，该漏洞源于外部动态列表 (EDL) 中包含的某些无效 URL 条目会导致设备服务器守护程序 (devsrvr) 停止响应。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Palo Alto Networks PAN-OS 10.1.* -

II. Public POCs for CVE-2021-3048

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III. Intelligence Information for CVE-2021-3048

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Vendor Advisories for CVE-2021-3048 (1)

Same Patch Batch · Palo Alto Networks · 2021-08-11 · 5 CVEs total

CVE-2021-3050 8.8 HIGH PAN-OS: OS Command Injection Vulnerability in Web Interface
CVE-2021-3046 6.8 MEDIUM PAN-OS: Improper SAML Authentication Vulnerability in GlobalProtect Portal
CVE-2021-3045 4.9 MEDIUM PAN-OS: OS Command Argument Injection in Web Interface
CVE-2021-3047 4.2 MEDIUM PAN-OS: Weak Cryptography Used in Web Interface Authentication

IV. Related Vulnerabilities

Same product: PAN-OS
Same vendor: Palo Alto Networks
Same weakness: CWE-20

V. Comments for CVE-2021-3048

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