Cisco IOS XR 7.3.3 Health Check access control

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.7$5k-$25k0.00

Summaryinfo

A vulnerability classified as critical has been found in Cisco IOS XR 7.3.3. The affected element is an unknown function of the component Health Check. The manipulation leads to access control. This vulnerability is documented as CVE-2022-20821. The attack can be initiated remotely. Additionally, an exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Cisco IOS XR 7.3.3 (Router Operating System). It has been rated as critical. This issue affects some unknown processing of the component Health Check. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is confidentiality, integrity, and availability.

The weakness was released 05/24/2022 as cisco-sa-iosxr-redis-ABJyE5xK. It is possible to read the advisory at tools.cisco.com. The identification of this vulnerability is CVE-2022-20821. Technical details are unknown but an exploit is available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 02/24/2025). The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

It is declared as attacked. The CISA Known Exploited Vulnerabilities Catalog lists this issue since 05/23/2022 with a due date of 06/13/2022:

Apply updates per vendor instructions.

Upgrading to version 7.3.4 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Zero-Day.cz (702). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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Vendor

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Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.8
VulDB Meta Temp Score: 6.7

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

NVD Base Score: 6.5
NVD Vector: 🔍

CNA Base Score: 6.5
CNA Vector (Cisco Systems, Inc.): 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Attacked

EPSS Score: 🔍
EPSS Percentile: 🔍

KEV Added: 🔍
KEV Due: 🔍
KEV Remediation: 🔍
KEV Ransomware: 🔍
KEV Notice: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Zero-Day.cz: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: IOS XR 7.3.4

Timelineinfo

11/02/2021 🔍
05/24/2022 +202 days 🔍
05/24/2022 +0 days 🔍
02/24/2025 +1007 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: cisco-sa-iosxr-redis-ABJyE5xK
Status: Confirmed

CVE: CVE-2022-20821 (🔍)
GCVE (CVE): GCVE-0-2022-20821
GCVE (VulDB): GCVE-100-200591
scip Labs: https://www.scip.ch/en/?labs.20150108

Entryinfo

Created: 05/24/2022 06:56
Updated: 02/24/2025 20:59
Changes: 05/24/2022 06:56 (40), 05/29/2022 10:19 (2), 05/29/2022 10:25 (12), 04/26/2024 10:43 (26), 06/19/2024 02:24 (2), 09/22/2024 23:32 (1), 02/24/2025 20:59 (19)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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