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PatchSiren cyber security CVE debrief

CVE-2022-20821 Cisco CVE debrief

CVE-2022-20821 is identified by CISA as the "Cisco IOS XR Open Port Vulnerability" and was added to the Known Exploited Vulnerabilities catalog on 2022-05-23. CISA’s record directs organizations to apply updates per vendor instructions, with a remediation due date of 2022-06-13. The source corpus does not include a vendor advisory or deeper technical write-up, so this debrief is limited to the official CVE, NVD, and CISA KEV references.

Vendor
Cisco
Product
IOS XR
CVSS
MEDIUM 6.5
CISA KEV
Listed
Original CVE published
2022-05-23
Original CVE updated
2022-05-23
Advisory published
2022-05-23
Advisory updated
2022-05-23

Who should care

Organizations running Cisco IOS XR, especially teams responsible for network infrastructure, patch management, and exposure review on externally reachable systems.

Technical summary

The official source data identifies the issue as a Cisco IOS XR open port vulnerability. CISA lists it in the KEV catalog, which indicates known exploitation and makes timely remediation important. No additional technical mechanics, attack path details, or affected-version specifics are present in the supplied corpus.

Defensive priority

High — CISA has placed this CVE in the Known Exploited Vulnerabilities catalog, so remediation should be prioritized and tracked against the listed due date.

Recommended defensive actions

  • Inventory Cisco IOS XR assets and determine whether any affected systems are deployed.
  • Apply vendor-provided updates or mitigations according to Cisco’s instructions.
  • Verify whether any IOS XR instances are exposed in higher-risk network segments or to untrusted networks.
  • Track remediation against the CISA KEV due date of 2022-06-13.
  • Monitor Cisco IOS XR systems for unusual access patterns or configuration changes until patching is complete.

Evidence notes

Evidence is limited to official records supplied in the corpus: the CISA KEV entry names CVE-2022-20821 as the Cisco IOS XR Open Port Vulnerability, marks it as known exploited, and provides the remediation direction to apply vendor updates. The CVE and NVD links are included for record lookup, but no additional vendor technical bulletin was supplied.

Sources and references

Verified primary and authoritative sources

  • CVE-2022-20821 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2022-20821

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2022-20821 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2022-20821

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.