Cisco IOS XE Unified Threat Defense access control

EntryeditHistoryDiffjsonxmlCTI
CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.4$5k-$25k0.00

A vulnerability, which was classified as critical, was found in Cisco IOS XE (Router Operating System) (the affected version unknown). This affects an unknown function of the component Unified Threat Defense/Application Quality of Experience. The manipulation with an unknown input leads to a privilege escalation vulnerability. CWE is classifying the issue as CWE-284. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

A vulnerability in the Zone-Based Policy Firewall feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to prevent the Zone-Based Policy Firewall from correctly classifying traffic. This vulnerability exists because ICMP and UDP responder-to-initiator flows are not inspected when the Zone-Based Policy Firewall has either Unified Threat Defense (UTD) or Application Quality of Experience (AppQoE) configured. An attacker could exploit this vulnerability by attempting to send UDP or ICMP flows through the network. A successful exploit could allow the attacker to inject traffic through the Zone-Based Policy Firewall, resulting in traffic being dropped because it is incorrectly classified or in incorrect reporting figures being produced by high-speed logging (HSL).

The weakness was published 09/23/2021 as cisco-sa-zbfw-pP9jfzwL. The advisory is shared at tools.cisco.com. This vulnerability is uniquely identified as CVE-2021-1625 since 11/13/2020. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 10/01/2021). MITRE ATT&CK project uses the attack technique T1068 for this issue.

Upgrading eliminates this vulnerability.

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CVSSv3infoedit

VulDB Meta Base Score: 6.6
VulDB Meta Temp Score: 6.4

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.8
CNA Vector (Cisco Systems, Inc.): 🔒

CVSSv2infoedit

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfoedit

Class: Privilege escalation
CWE: CWE-284
ATT&CK: T1068

Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfoedit

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: tools.cisco.com

Timelineinfoedit

11/13/2020 CVE assigned
09/23/2021 +313 days Advisory disclosed
09/23/2021 +0 days VulDB entry created
10/01/2021 +8 days VulDB last update

Sourcesinfoedit

Vendor: https://www.cisco.com/

Advisory: cisco-sa-zbfw-pP9jfzwL
Status: Confirmed

CVE: CVE-2021-1625 (🔒)
scip Labs: https://www.scip.ch/en/?labs.20150108

Entryinfoedit

Created: 09/23/2021 09:17 AM
Updated: 10/01/2021 12:39 PM
Changes: (1) source_cve_nvd_summary
Complete: 🔍

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