Detections
Analytics
Siemens SCALANCE and RUGGEDCOM Devices Incorrect Comparison (CVE-2024-9681)
medium Tenable OT Security Plugin ID 504760
Synopsis
The remote OT asset is affected by a vulnerability.Description
When curl is asked to use HSTS, the expiry time for a subdomain might overwrite a parent domain's cache entry, making it end sooner or later than otherwise intended. This affects curl using applications that enable HSTS and use URLs with the insecure `HTTP://` scheme and perform transfers with hosts like `x.example.com` as well as `example.com` where the first host is a subdomain of the second host.(The HSTS cache either needs to have been populated manually or there needs to have been previous HTTPS accesses done as the cache needs to have entries for the domains involved to trigger this problem.) When `x.example.com` responds with `Strict-Transport-Security:` headers, this bug can make the subdomain's expiry timeout *bleed over* and get set for the parent domain `example.com` in curl's HSTS cache. The result of a triggered bug is that HTTP accesses to `example.com` get converted to HTTPS for a different period of time than what was asked for by the origin server. If `example.com` for example stops supporting HTTPS at its expiry time, curl might then fail to access `http://example.com` until the (wrongly set) timeout expires. This bug can also expire the parent's entry *earlier*, thus making curl inadvertently switch back to insecure HTTP earlier than otherwise intended.
This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.
Solution
The following text was originally created by the Cybersecurity and Infrastructure Security Agency (CISA). The original can be found at CISA.gov.Siemens has identified the following specific workarounds and mitigations users can apply to reduce risk:
- All affected products: Update to V3.2 or later version
As a general security measure, Siemens recommends protecting network access to devices with appropriate mechanisms. To operate the devices in a protected IT environment, Siemens recommends configuring the environment according to Siemens' operational guidelines for industrial security and following recommendations in the product manuals.
Additional information on industrial security by Siemens can be found on the Siemens industrial security webpage
For more information see the associated Siemens security advisory SSA-355557 in HTML and CSAF.
See Also
https://cert-portal.siemens.com/productcert/html/ssa-355557.html
https://support.industry.siemens.com/cs/ww/en/view/109988839/
https://www.cisa.gov/news-events/ics-advisories/ICSA-25-226-07
https://cert-portal.siemens.com/productcert/html/ssa-089022.html
Plugin Details
Severity: Medium
ID: 504760
File Name: tenable_ot_siemens_CVE-2024-9681.nasl
Version: 1.5
Type: remote
Family: Tenable.ot
Published: 11/18/2025
Updated: 3/12/2026
Supported Sensors: Tenable OT Security
Risk Information
VPR
Risk Factor: Medium
Score: 5.0
CVSS v2
Risk Factor: Medium
Base Score: 6.1
Temporal Score: 4.8
Vector: CVSS2#AV:N/AC:H/Au:N/C:N/I:C/A:P
CVSS Score Source: CVE-2024-9681
CVSS v3
Risk Factor: Medium
Base Score: 6.5
Temporal Score: 5.9
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L
Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C
Vulnerability Information
CPE: cpe:/o:siemens:scalance_xrh-300_series_firmware, cpe:/o:siemens:scalance_xc-300_series_firmware, cpe:/o:siemens:scalance_xc-400_series_firmware, cpe:/o:siemens:scalance_xch-300_series_firmware, cpe:/o:siemens:scalance_xrm-300_series_firmware, cpe:/o:siemens:scalance_xcm-300_series_firmware, cpe:/o:siemens:scalance_xr-500_series_firmware, cpe:/o:siemens:ruggedcom_rst2428p_firmware:3.2, cpe:/o:siemens:scalance_xr-500wg_series_firmware, cpe:/o:siemens:scalance_xr-300_series_firmware
Required KB Items: Tenable.ot/Siemens
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 8/12/2025
Vulnerability Publication Date: 8/12/2025
Reference Information
CVE: CVE-2024-9681
CWE: 697
ICSA: 25-226-07