SSA-734552

Vulnerability from csaf_siemens - Published: 2026-07-14 00:00 - Updated: 2026-07-14 00:00
Summary
SSA-734552: Buffer Overflow Vulnerability in OpenSSL Affecting Desigo CC
Notes
Summary: OpenSSL has published a stack based buffer overflow vulnerability that allows a remote attacker to cause a denial of service (DoS) or potentially allow for remote code execution. Siemens has released new versions for several affected products and recommends to update to the latest versions. Siemens is preparing further fix versions and recommends countermeasures for products where fixes are not, or not yet available.
General Recommendations: Operators of critical power systems (e.g. TSOs or DSOs) worldwide are usually required by regulations to build resilience into the power grids by applying multi-level redundant secondary protection schemes. It is therefore recommended that the operators check whether appropriate resilient protection measures are in place. The risk of cyber incidents impacting the grid's reliability can thus be minimized by virtue of the grid design. Siemens strongly recommends applying the provided security updates using the corresponding tooling and documented procedures made available with the product. If supported by the product, an automated means to apply the security updates across multiple product instances may be used. Siemens strongly recommends prior validation of any security update before being applied, and supervision by trained staff of the update process in the target environment. As a general security measure Siemens strongly recommends to protect network access with appropriate mechanisms (e.g. firewalls, segmentation, VPN). It is advised to configure the environment according to our operational guidelines in order to run the devices in a protected IT environment. Recommended security guidelines can be found at: https://www.siemens.com/gridsecurity
Additional Resources: For further inquiries on security vulnerabilities in Siemens products and solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert/advisories
Terms of Use: The use of Siemens Security Advisories is subject to the terms and conditions listed on: https://www.siemens.com/productcert/terms-of-use.
CVE-2025-15467

Issue summary: Parsing CMS AuthEnvelopedData message with maliciously crafted AEAD parameters can trigger a stack buffer overflow. Impact summary: A stack buffer overflow may lead to a crash, causing Denial of Service, or potentially remote code execution. When parsing CMS AuthEnvelopedData structures that use AEAD ciphers such as AES-GCM, the IV (Initialization Vector) encoded in the ASN.1 parameters is copied into a fixed-size stack buffer without verifying that its length fits the destination. An attacker can supply a crafted CMS message with an oversized IV, causing a stack-based out-of-bounds write before any authentication or tag verification occurs. Applications and services that parse untrusted CMS or PKCS#7 content using AEAD ciphers (e.g., S/MIME AuthEnvelopedData with AES-GCM) are vulnerable. Because the overflow occurs prior to authentication, no valid key material is required to trigger it. While exploitability to remote code execution depends on platform and toolchain mitigations, the stack-based write primitive represents a severe risk. The FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the CMS implementation is outside the OpenSSL FIPS module boundary. OpenSSL 3.6, 3.5, 3.4, 3.3 and 3.0 are vulnerable to this issue. OpenSSL 1.1.1 and 1.0.2 are not affected by this issue.

9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE-787 - Out-of-bounds Write
Affected products
Product Identifier Version Remediation
Desigo CC family V7
Siemens / Desigo CC family V7
 vers:all/*
None Available
Desigo CC family V8 < V8.0.2.0021
Siemens / Desigo CC family V8
 vers:intdot/<8.0.2.0021
Vendor Fix fix
Desigo CC family V9 < V9.0.1
Siemens / Desigo CC family V9
 vers:intdot/<9.0.1
Vendor Fix fix
References
To clipboard 

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    "csaf_version": "2.0",
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    "notes": [
      {
        "category": "summary",
        "text": "OpenSSL has published a stack based buffer overflow vulnerability that allows a remote attacker to cause a denial of service (DoS) or potentially allow for remote code execution.\n\nSiemens has released new versions for several affected products and recommends to update to the latest versions. Siemens is preparing further fix versions and recommends countermeasures for products where fixes are not, or not yet available.",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "Operators of critical power systems (e.g. TSOs or DSOs) worldwide are usually required by regulations to build resilience into the power grids by applying multi-level redundant secondary protection schemes. It is therefore recommended that the operators check whether appropriate resilient protection measures are in place. The risk of cyber incidents impacting the grid\u0027s reliability can thus be minimized by virtue of the grid design.\nSiemens strongly recommends applying the provided security updates using the corresponding tooling and documented procedures made available with the product. If supported by the product, an automated means to apply the security updates across multiple product instances may be used. Siemens strongly recommends prior validation of any security update before being applied, and supervision by trained staff of the update process in the target environment. \nAs a general security measure Siemens strongly recommends to protect network access with appropriate mechanisms (e.g. firewalls, segmentation, VPN). It is advised to configure the environment according to our operational guidelines in order to run the devices in a protected IT environment.\n\nRecommended security guidelines can be found at:\nhttps://www.siemens.com/gridsecurity",
        "title": "General Recommendations"
      },
      {
        "category": "general",
        "text": "For further inquiries on security vulnerabilities in Siemens products and solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert/advisories",
        "title": "Additional Resources"
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      {
        "category": "legal_disclaimer",
        "text": "The use of Siemens Security Advisories is subject to the terms and conditions listed on: https://www.siemens.com/productcert/terms-of-use.",
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        "summary": "SSA-734552: Buffer Overflow Vulnerability in OpenSSL Affecting Desigo CC - HTML Version",
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      },
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        "url": "https://cert-portal.siemens.com/productcert/csaf/ssa-734552.json"
      }
    ],
    "title": "SSA-734552: Buffer Overflow Vulnerability in OpenSSL Affecting Desigo CC",
    "tracking": {
      "current_release_date": "2026-07-14T00:00:00.000Z",
      "generator": {
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          "version": "1"
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      "revision_history": [
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          "number": "1",
          "summary": "Publication Date"
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  "product_tree": {
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              {
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                }
              }
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        "category": "vendor",
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  "vulnerabilities": [
    {
      "cve": "CVE-2025-15467",
      "cwe": {
        "id": "CWE-787",
        "name": "Out-of-bounds Write"
      },
      "notes": [
        {
          "category": "description",
          "text": "Issue summary: Parsing CMS AuthEnvelopedData message with maliciously\r\ncrafted AEAD parameters can trigger a stack buffer overflow.\r\nImpact summary: A stack buffer overflow may lead to a crash, causing Denial\r\nof Service, or potentially remote code execution.\r\n\r\nWhen parsing CMS AuthEnvelopedData structures that use AEAD ciphers such as\r\nAES-GCM, the IV (Initialization Vector) encoded in the ASN.1 parameters is\r\ncopied into a fixed-size stack buffer without verifying that its length fits\r\nthe destination. An attacker can supply a crafted CMS message with an\r\noversized IV, causing a stack-based out-of-bounds write before any\r\nauthentication or tag verification occurs.\r\n\r\nApplications and services that parse untrusted CMS or PKCS#7 content using\r\nAEAD ciphers (e.g., S/MIME AuthEnvelopedData with AES-GCM) are vulnerable.\r\nBecause the overflow occurs prior to authentication, no valid key material\r\nis required to trigger it. While exploitability to remote code execution\r\ndepends on platform and toolchain mitigations, the stack-based write\r\nprimitive represents a severe risk.\r\n\r\nThe FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this\r\nissue, as the CMS implementation is outside the OpenSSL FIPS module\r\nboundary.\r\n\r\nOpenSSL 3.6, 3.5, 3.4, 3.3 and 3.0 are vulnerable to this issue.\r\n\r\nOpenSSL 1.1.1 and 1.0.2 are not affected by this issue.",
          "title": "CVE Description"
        }
      ],
      "product_status": {
        "known_affected": [
          "1",
          "2",
          "3"
        ]
      },
      "remediations": [
        {
          "category": "none_available",
          "details": "Currently no fix is available",
          "product_ids": [
            "1"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Update to V8.0 QU2.0021 or later version",
          "product_ids": [
            "2"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109989041/"
        },
        {
          "category": "vendor_fix",
          "details": "Update to V9.0 QU1 or later version",
          "product_ids": [
            "3"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/110002555/"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
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            "2",
            "3"
          ]
        }
      ],
      "title": "CVE-2025-15467"
    }
  ]
}



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