# Siemens RUGGEDCOM CROSSBOW SAC buffer overflow and DoS flaws

Published: 2025-08-14 · Severity: routine · Sectors: manufacturing
Canonical: https://vorant.io/reports/df84d0e9-b098-5a10-9ed9-0cfb9e69af00/siemens-ruggedcom-crossbow-sac-buffer-overflow-and-dos-flaws

> Three SQLite vulnerabilities in Siemens RUGGEDCOM CROSSBOW Station Access Controller allow remote code execution or denial of service; upgrade to V5.7.

Siemens RUGGEDCOM CROSSBOW Station Access Controller versions prior to V5.7 contain three memory safety vulnerabilities in the embedded SQLite database engine. Two are integer overflow flaws in SQLite's concat_ws() function that lead to heap buffer overflow with potential for arbitrary code execution (CVE-2025-3277, CVSS 8.3 v3.1) or out-of-bounds memory writes (CVE-2025-29087, CVSS 5.5 v3.1). The third is a denial-of-service vulnerability via the SQLITE_DBCONFIG_LOOKASIDE component (CVE-2025-29088, CVSS 7.5 v3.1). The most severe flaw, CVE-2025-3277, requires only network access and no authentication; an attacker supplying a large separator string to concat_ws() can trigger an integer overflow during buffer allocation, then overflow the undersized heap buffer with the full untruncated string, achieving code execution on the access controller.

The RUGGEDCOM CROSSBOW SAC is deployed globally in critical manufacturing environments for industrial access control. CISA reports no known public exploitation in the wild as of the advisory date, but the remotely exploitable nature of CVE-2025-3277 (CVSS v4 6.9, AV:N, AC:L, PR:N) presents material risk to operational technology networks. Mitigation is straightforward: update to version V5.7 or later. Organizations should also enforce network segmentation, restrict internet exposure, and apply standard ICS hardening practices.

## Mentioned in this report

- Vulnerabilities: CVE-2025-29087, CVE-2025-29088, CVE-2025-3277

## Detection guidance (public sample)

### SQL concat_ws() Function Call in Web Request Query String

ATT&CK: T1190

concat_ws() invoked in the URI query of a web request, a possible attempt to reach SQLite concat_ws integer-overflow flaws (CVE-2025-3277, CVE-2025-29087). Auto-generated starting point — validate and tune in your environment before deploying. IOC matches can false-positive on shared infrastructure and decay as adversary infrastructure rotates.

```yaml
title: SQL concat_ws() Function Call in Web Request Query String
id: 3a9ea38c-7d89-5ec4-9d41-4e1a2fb6f7da
status: experimental
description: Detects web requests whose query string carries a call to the SQL concat_ws()
  function, in plain or URL-encoded form. The SQLite concat_ws() integer overflow
  flaws (CVE-2025-3277, CVE-2025-29087) are triggered by attacker-supplied SQL with
  an oversized separator string, so this may indicate an exploitation attempt against
  embedded SQLite in an exposed web management interface. Unusually long query strings
  strengthen the signal. Generalises on the function name, not on specific payload
  content.
tags:
- attack.initial-access
- attack.t1190
- attack.impact
- attack.t1499.004
logsource:
  category: webserver
detection:
  selection:
    cs-uri-query|contains:
    - concat_ws(
    - concat_ws%28
    - concat_ws%20(
  condition: selection
falsepositives:
- Legitimate web applications that pass SQL expressions in query parameters, such
  as reporting or query-builder tools
- Authorized vulnerability scanners or penetration tests run against the device
level: medium
author: Vorant
references:
- https://www.cisa.gov/news-events/ics-advisories/icsa-25-226-08
```

Behavioural rules are generated from public reporting — validate in your environment before deploying.

Source reporting: https://www.cisa.gov/news-events/ics-advisories/icsa-25-226-08

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