PatchSiren

PatchSiren cyber security CVE debrief

CVE-2024-2466 curl CVE debrief

A vulnerability in libcurl's mbedTLS integration causes complete TLS certificate validation bypass when connecting to hosts specified as IP addresses. The flaw affects Siemens SINEC NMS and potentially other products using vulnerable libcurl builds with mbedTLS. CISA published advisory ICSA-24-319-04 on November 12, 2024, coordinating with Siemens' security advisory SSA-331112. The vulnerability is not listed in CISA's Known Exploited Vulnerabilities catalog.

Vendor
curl
Product
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
CVSS
HIGH 7.1
CISA KEV
Not listed in stored evidence
Original CVE published
2023-12-12
Original CVE updated
2025-08-12
Advisory published
2023-12-12
Advisory updated
2025-08-12

Who should care

Organizations operating Siemens SINEC NMS network management systems, industrial control system operators using libcurl with mbedTLS, and security teams responsible for TLS certificate validation in embedded or industrial networking products.

Technical summary

When libcurl is built with mbedTLS and configured to connect to a host specified as an IP address rather than a hostname, the library incorrectly avoids calling the set hostname function. This causes complete bypass of server certificate validation for all TLS-based protocols including HTTPS, FTPS, IMAPS, POP3S, and SMTPS. The vulnerability stems from improper hostname handling logic that treats IP addresses differently from DNS names, failing to establish the expected TLS identity verification context.

Defensive priority

HIGH

Recommended defensive actions

  • Update Siemens SINEC NMS to V3.0 SP1 or later version per vendor guidance
  • Audit systems for libcurl builds using mbedTLS that connect to IP addresses directly
  • Implement network segmentation for industrial control systems per CISA recommended practices
  • Monitor TLS connections for anomalous certificate validation behavior
  • Review application configurations to avoid direct IP address connections where hostname validation is required

Evidence notes

CVE published and modified 2024-11-12 per official record. CISA advisory ICSA-24-319-04 published same date. Siemens remediation guidance specifies update to V3.0 SP1 or later.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-2466 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-2466

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

  • CVE-2024-2466 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-2466

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

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2023/icsa-23-348-10.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/csaf/ssa-398330.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/html/ssa-398330.html

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-23-348-10

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/resources-tools/resources/ics-recommended-practices

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/topics/industrial-control-systems

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf

    Reference

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.