PatchSiren

PatchSiren cyber security CVE debrief

CVE-2025-25248 Siemens CVE debrief

CVE-2025-25248 is a medium-severity availability issue tied to an integer overflow/wraparound in SSL-VPN RDP and VNC bookmark handling. According to the supplied advisory text, an authenticated user may be able to affect SSL-VPN availability via crafted requests. The corpus also shows a metadata inconsistency: the CVE description names FortiOS, FortiProxy, and FortiPAM, while the source item is labeled Siemens RUGGEDCOM APE1808. The debrief below follows the CVE description and remediation fields and flags that mismatch.

Vendor
Siemens
Product
RUGGEDCOM APE1808
CVSS
MEDIUM 5.3
CISA KEV
Not listed in stored evidence
Original CVE published
2025-05-13
Original CVE updated
2026-07-09
Advisory published
2025-05-13
Advisory updated
2026-07-09

Who should care

Security and operations teams that manage SSL-VPN deployments and bookmark-driven remote-access workflows, especially environments using the affected Fortinet product lines named in the CVE text. Incident responders should also watch for authentication-side availability disruptions.

Technical summary

The advisory describes CWE-190 integer overflow/wraparound in SSL-VPN RDP/VNC bookmark processing. The impact is availability-only: a network-accessible authenticated attacker with low privileges and no user interaction may be able to degrade or disrupt SSL-VPN service. The provided CVSS vector is CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RC:R, which aligns with a difficult-but-feasible availability impact rather than code execution or data exposure.

Defensive priority

Medium

Recommended defensive actions

  • Apply the vendor remediation listed in the source corpus: update Fortigate NGFW to V7.4.9 or later using the secure update procedure.
  • Inventory SSL-VPN exposure and confirm whether RDP and VNC bookmark features are enabled or necessary.
  • Monitor authentication and VPN logs for unusual request patterns, repeated failures, or availability degradation affecting SSL-VPN services.
  • Follow CISA ICS recommended practices and defense-in-depth guidance for segmentation, least privilege, and service hardening.
  • Track the CISA/Siemens advisory revisions for remediation updates before and after deployment.

Evidence notes

The supplied timeline indicates publication on 2025-05-13, with later source revisions on 2025-09-09, 2026-01-22, and 2026-02-12; those are advisory update dates, not the original vulnerability issue date. No KEV listing is present in the provided corpus. The CVSS vector indicates network reachability, high attack complexity, low privileges, no user interaction, and availability impact only. The source corpus contains an internal vendor/product mismatch: the advisory metadata labels Siemens RUGGEDCOM APE1808, while the CVE description and remediation text reference FortiOS/FortiProxy/FortiPAM and Fortigate NGFW.

Sources and references

Verified primary and authoritative sources

  • CVE-2025-25248 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-25248

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

  • CVE-2025-25248 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-25248

    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/2025/icsa-25-135-01.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/csaf/ssa-864900.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/html/ssa-864900.html

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-25-135-01

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/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://www.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.