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PatchSiren cyber security CVE debrief

CVE-2024-21887 Ivanti CVE debrief

CVE-2024-21887 affects Ivanti Connect Secure and Policy Secure and is identified by CISA as a known exploited vulnerability. CISA added it to the KEV catalog on 2024-01-10, with a remediation due date of 2024-01-22, and marked known ransomware campaign use as Known. For defenders, this is a high-priority internet-facing gateway issue: follow vendor instructions referenced by CISA, and if mitigations are not available, discontinue use of the product.

Vendor
Ivanti
Product
Connect Secure and Policy Secure
CVSS
CRITICAL 9.1
CISA KEV
Listed
Original CVE published
2024-01-10
Original CVE updated
2026-09-27
Advisory published
2026-09-27
Advisory updated
2026-09-27

Who should care

Security and infrastructure teams responsible for Ivanti Connect Secure/Policy Secure appliances, especially internet-facing VPN and remote access gateways; incident responders and SOC teams monitoring for active exploitation.

Technical summary

The supplied source corpus identifies CVE-2024-21887 as a command injection vulnerability in Ivanti Connect Secure and Policy Secure. CISA lists it in the Known Exploited Vulnerabilities catalog and links vendor guidance for mitigation. The available source material does not provide additional technical mechanics, affected versions, or exploit-chain details, so defenders should rely on vendor and CISA guidance for exact remediation steps.

Defensive priority

Critical

Recommended defensive actions

  • Apply mitigations per Ivanti's vendor instructions referenced by CISA.
  • If mitigations are unavailable, discontinue use of the affected product, per CISA guidance.
  • Treat exposed Ivanti gateways as urgent internet-facing assets and prioritize remediation before the KEV due date.
  • Review authentication, configuration, and system logs for signs of abnormal activity around the mitigation window.
  • Track the official CVE, NVD, and CISA KEV entries for any updates to remediation guidance or scope.

Evidence notes

This debrief is limited to the supplied source corpus: the CISA KEV entry, its embedded vendor-note text, and the official CVE/NVD links. The corpus confirms the CVE identifier, product family, vulnerability class (command injection), KEV listing date (2024-01-10), due date (2024-01-22), and that known ransomware campaign use is marked 'Known'. It does not include version ranges, exploit steps, or patch specifics.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-21887 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-21887

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

  • CVE-2024-21887 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-21887

    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.