Known Exploited Vulnerability
6.5
MEDIUM
CVE-2022-20821
Cisco IOS XR Open Port Vulnerability - [Actively Exploited]
Description

A vulnerability in the health check RPM of Cisco IOS XR Software could allow an unauthenticated, remote attacker to access the Redis instance that is running within the NOSi container. This vulnerability exists because the health check RPM opens TCP port 6379 by default upon activation. An attacker could exploit this vulnerability by connecting to the Redis instance on the open port. A successful exploit could allow the attacker to write to the Redis in-memory database, write arbitrary files to the container filesystem, and retrieve information about the Redis database. Given the configuration of the sandboxed container that the Redis instance runs in, a remote attacker would be unable to execute remote code or abuse the integrity of the Cisco IOS XR Software host system.

INFO

Published Date :

May 26, 2022, 2:15 p.m.

Last Modified :

July 2, 2024, 5:05 p.m.

Source :

[email protected]

Remotely Exploitable :

Yes !

Impact Score :

2.5

Exploitability Score :

3.9
CISA Notification
CISA KEV (Known Exploited Vulnerabilities)

For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.

Description :

Cisco IOS XR software health check opens TCP port 6379 by default on activation. An attacker can connect to the Redis instance on the open port and allow access to the Redis instance that is running within the NOSi container.

Required Action :

Apply updates per vendor instructions.

Public PoC/Exploit Available at Github

CVE-2022-20821 has a 3 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

Affected Products

The following products are affected by CVE-2022-20821 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Cisco ios_xr
2 Cisco 8201
3 Cisco 8202
4 Cisco 8208
5 Cisco 8212
6 Cisco 8218
7 Cisco ncs-55a1-24h
8 Cisco ncs-55a1-24q6h-s
9 Cisco ncs-55a1-36h-s
10 Cisco ncs-55a1-36h-se
11 Cisco ncs-55a1-36h-se-s
12 Cisco ncs-55a2-mod-hd-s
13 Cisco ncs-55a2-mod-hx-s
14 Cisco ncs-55a2-mod-s
15 Cisco ncs-55a2-mod-se-h-s
16 Cisco ncs-55a2-mod-se-s
17 Cisco ncs_1001
18 Cisco ncs_1002
19 Cisco ncs_1004
20 Cisco ncs_5001
21 Cisco ncs_5002
22 Cisco ncs_5501-se
23 Cisco ncs_5502-se
24 Cisco ncs_5504
25 Cisco ncs_5508
26 Cisco ncs_5516
27 Cisco ncs_55a1
28 Cisco ncs_55a2
: Total Affected Vendor : 1 | Products : 28
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2022-20821.

URL Resource
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-redis-ABJyE5xK Vendor Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Profile Photo
santosomar/kev_checker

A basic Python program to check Cybersecurity & Infrastructure Security Agency (CISA) Known Exploited Vulnerabilities (KEV) Catalog

Python

Updated: 3 months, 1 week ago
15 stars 2 fork 2 watcher
Born at : Feb. 9, 2023, 5:26 p.m. This repo has been linked 14 different CVEs too.
Profile Photo
Ostorlab/KEV

Ostorlab KEV: One-command to detect most remotely known exploitable vulnerabilities. Sourced from CISA KEV, Google's Tsunami, Ostorlab's Asteroid and Bug Bounty programs.

cisa-kev vulnerability 0day cisa exploits

Updated: 2 months ago
516 stars 32 fork 32 watcher
Born at : April 19, 2022, 8:58 a.m. This repo has been linked 1181 different CVEs too.
Profile Photo
AlphabugX/CVE-2022-RCE

test 反向辣鸡数据投放 CVE-2022-23305 工具 利用 教程 Exploit POC

cve-2020-

Updated: 2 years ago
5 stars 2 fork 2 watcher
Born at : Jan. 21, 2022, 5:07 a.m. This repo has been linked 2608 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2022-20821 vulnerability anywhere in the article.

  • TheCyberThrone
Cisco reveals no patch available for CVE-2024-20393 and CVE-2024-20470

Cisco  has revealed multiple vulnerabilities impacting its Small Business RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers, which could potentially expose businesses to serious security r ... Read more

Published Date: Oct 07, 2024 (1 month ago)
CVE-2024-20470 CVE-2024-20393 CVE-2024-38200 CVE-2024-4058 CVE-2023-20198 CVE-2022-20821 CVE-2021-1048 CVE-2021-0920

The following table lists the changes that have been made to the CVE-2022-20821 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Modified Analysis by [email protected]

    Jul. 02, 2024

    Action Type Old Value New Value
    Removed CWE NIST CWE-200
    Added CWE NIST NVD-CWE-noinfo
    Changed CPE Configuration AND OR cpe:2.3:h:cisco:8201:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8202:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8208:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8212:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8218:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs-55a1-24h:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs-55a1-24q6h-s:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs-55a1-36h-s:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs-55a1-36h-se:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs-55a1-36h-se-s:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs-55a2-mod-hd-s:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs-55a2-mod-hx-s:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs-55a2-mod-s:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs-55a2-mod-se-h-s:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs-55a2-mod-se-s:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_1001:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_1002:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_1004:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5001:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5002:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5501-se:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5502-se:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5504:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5508:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5516:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_55a1:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_55a2:-:*:*:*:*:*:*:* OR *cpe:2.3:o:cisco:ios_xr:-:*:*:*:*:*:*:* AND OR *cpe:2.3:o:cisco:ios_xr:-:*:*:*:*:*:*:* OR cpe:2.3:h:cisco:8201:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8202:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8208:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8212:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8218:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs-55a1-24h:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs-55a1-24q6h-s:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs-55a1-36h-s:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs-55a1-36h-se:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs-55a1-36h-se-s:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs-55a2-mod-hd-s:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs-55a2-mod-hx-s:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs-55a2-mod-s:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs-55a2-mod-se-h-s:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs-55a2-mod-se-s:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_1001:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_1002:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_1004:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5001:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5002:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5501-se:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5502-se:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5504:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5508:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5516:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_55a1:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_55a2:-:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Nov. 07, 2023

    Action Type Old Value New Value
    Removed CVSS V3 Cisco Systems, Inc. AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
    Added CVSS V3.1 Cisco Systems, Inc. AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
  • Initial Analysis by [email protected]

    Jun. 07, 2022

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:P/A:N)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
    Changed Reference Type https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-redis-ABJyE5xK No Types Assigned https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-redis-ABJyE5xK Vendor Advisory
    Added CWE NIST CWE-200
    Added CPE Configuration AND OR *cpe:2.3:o:cisco:ios_xr:-:*:*:*:*:*:*:* OR cpe:2.3:h:cisco:8201:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8202:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8208:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8212:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8218:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs-55a1-24h:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs-55a1-24q6h-s:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs-55a1-36h-s:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs-55a1-36h-se:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs-55a1-36h-se-s:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs-55a2-mod-hd-s:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs-55a2-mod-hx-s:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs-55a2-mod-s:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs-55a2-mod-se-h-s:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs-55a2-mod-se-s:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_1001:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_1002:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_1004:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5001:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5002:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5501-se:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5502-se:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5504:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5508:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5516:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_55a1:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_55a2:-:*:*:*:*:*:*:*
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2022-20821 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2022-20821 weaknesses.

CAPEC-13: Subverting Environment Variable Values Subverting Environment Variable Values CAPEC-22: Exploiting Trust in Client Exploiting Trust in Client CAPEC-59: Session Credential Falsification through Prediction Session Credential Falsification through Prediction CAPEC-60: Reusing Session IDs (aka Session Replay) Reusing Session IDs (aka Session Replay) CAPEC-79: Using Slashes in Alternate Encoding Using Slashes in Alternate Encoding CAPEC-116: Excavation Excavation CAPEC-169: Footprinting Footprinting CAPEC-224: Fingerprinting Fingerprinting CAPEC-285: ICMP Echo Request Ping ICMP Echo Request Ping CAPEC-287: TCP SYN Scan TCP SYN Scan CAPEC-290: Enumerate Mail Exchange (MX) Records Enumerate Mail Exchange (MX) Records CAPEC-291: DNS Zone Transfers DNS Zone Transfers CAPEC-292: Host Discovery Host Discovery CAPEC-293: Traceroute Route Enumeration Traceroute Route Enumeration CAPEC-294: ICMP Address Mask Request ICMP Address Mask Request CAPEC-295: Timestamp Request Timestamp Request CAPEC-296: ICMP Information Request ICMP Information Request CAPEC-297: TCP ACK Ping TCP ACK Ping CAPEC-298: UDP Ping UDP Ping CAPEC-299: TCP SYN Ping TCP SYN Ping CAPEC-300: Port Scanning Port Scanning CAPEC-301: TCP Connect Scan TCP Connect Scan CAPEC-302: TCP FIN Scan TCP FIN Scan CAPEC-303: TCP Xmas Scan TCP Xmas Scan CAPEC-304: TCP Null Scan TCP Null Scan CAPEC-305: TCP ACK Scan TCP ACK Scan CAPEC-306: TCP Window Scan TCP Window Scan CAPEC-307: TCP RPC Scan TCP RPC Scan CAPEC-308: UDP Scan UDP Scan CAPEC-309: Network Topology Mapping Network Topology Mapping CAPEC-310: Scanning for Vulnerable Software Scanning for Vulnerable Software CAPEC-312: Active OS Fingerprinting Active OS Fingerprinting CAPEC-313: Passive OS Fingerprinting Passive OS Fingerprinting CAPEC-317: IP ID Sequencing Probe IP ID Sequencing Probe CAPEC-318: IP 'ID' Echoed Byte-Order Probe IP 'ID' Echoed Byte-Order Probe CAPEC-319: IP (DF) 'Don't Fragment Bit' Echoing Probe IP (DF) 'Don't Fragment Bit' Echoing Probe CAPEC-320: TCP Timestamp Probe TCP Timestamp Probe CAPEC-321: TCP Sequence Number Probe TCP Sequence Number Probe CAPEC-322: TCP (ISN) Greatest Common Divisor Probe TCP (ISN) Greatest Common Divisor Probe CAPEC-323: TCP (ISN) Counter Rate Probe TCP (ISN) Counter Rate Probe CAPEC-324: TCP (ISN) Sequence Predictability Probe TCP (ISN) Sequence Predictability Probe CAPEC-325: TCP Congestion Control Flag (ECN) Probe TCP Congestion Control Flag (ECN) Probe CAPEC-326: TCP Initial Window Size Probe TCP Initial Window Size Probe CAPEC-327: TCP Options Probe TCP Options Probe CAPEC-328: TCP 'RST' Flag Checksum Probe TCP 'RST' Flag Checksum Probe CAPEC-329: ICMP Error Message Quoting Probe ICMP Error Message Quoting Probe CAPEC-330: ICMP Error Message Echoing Integrity Probe ICMP Error Message Echoing Integrity Probe CAPEC-472: Browser Fingerprinting Browser Fingerprinting CAPEC-497: File Discovery File Discovery CAPEC-508: Shoulder Surfing Shoulder Surfing CAPEC-573: Process Footprinting Process Footprinting CAPEC-574: Services Footprinting Services Footprinting CAPEC-575: Account Footprinting Account Footprinting CAPEC-576: Group Permission Footprinting Group Permission Footprinting CAPEC-577: Owner Footprinting Owner Footprinting CAPEC-616: Establish Rogue Location Establish Rogue Location CAPEC-643: Identify Shared Files/Directories on System Identify Shared Files/Directories on System CAPEC-646: Peripheral Footprinting Peripheral Footprinting CAPEC-651: Eavesdropping Eavesdropping
Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.37 }} 0.03%

score

0.69518

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
: