Vulnerability-Lookup

CVE-2021-38604 (GCVE-0-2021-38604)

Vulnerability from cvelistv5 – Published: 2021-08-12 15:43 – Updated: 2026-10-14 11:53

Summary

In librt in the GNU C Library (aka glibc) through 2.34, sysdeps/unix/sysv/linux/mq_notify.c mishandles certain NOTIFY_REMOVED data, leading to a NULL pointer dereference. NOTE: this vulnerability was introduced as a side effect of the CVE-2021-33574 fix.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-05-30 19:18 UTC

CWE

n/a
CWE-476 - NULL Pointer Dereference

Assigner

mitre CNA under the mitre root

CNA scorecard E 28/100 over 2319 records in the last 180 days details

References

10 references

URL	Tags
https://sourceware.org/git/?p=glibc.git%3Ba=commi…	x_refsource_MISC
https://sourceware.org/git/?p=glibc.git%3Ba=commi…	x_refsource_MISC
https://sourceware.org/bugzilla/show_bug.cgi?id=28213	x_refsource_MISC
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://www.oracle.com/security-alerts/cpujul2022.html	x_refsource_MISC
https://blog.tuxcare.com/cve/tuxcare-team-identif…	x_refsource_MISC
https://security.netapp.com/advisory/ntap-2021090…	x_refsource_CONFIRM
https://security.gentoo.org/glsa/202208-24	vendor-advisoryx_refsource_GENTOO
https://cert-portal.siemens.com/productcert/html/…
https://cert-portal.siemens.com/productcert/html/…

Impacted products

3 products

Vendor	Product	Version	CPE status
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.0 , < V3.1.5 (custom)	guessed
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP	Affected: V3.1.0 , < V3.1.5 (custom)	guessed
Siemens	SIPLUS S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.0 , < V3.1.5 (custom)	guessed

Show details on NVD website

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ICSA-23-166-10

Vulnerability from csaf_cisa - Published: 2023-06-13 00:00 - Updated: 2024-04-09 00:00

Summary

Siemens SIMATIC S7-1500 TM MFP BIOS

Scope

72 vulnerabilities in this advisory, including CVE-2021-38604.

CVE-2021-38604

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C

Known affected: 1 product

https://support.industry.siemens.com/cs/ww/en/view/109945851/

Open the full advisory

ICSA-23-348-10

Vulnerability from csaf_cisa - Published: 2023-12-12 00:00 - Updated: 2025-08-12 00:00

Summary

Siemens SIMATIC S7-1500

Scope

544 vulnerabilities in this advisory, including CVE-2021-38604.

CVE-2021-38604

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C

Known affected: 5 products

https://support.industry.siemens.com/cs/ww/en/view/109478459/

Open the full advisory

MSRC_CVE-2021-38604

Vulnerability from csaf_microsoft - Published: 2021-08-02 00:00 - Updated: 2021-12-16 00:00

Summary

In librt in the GNU C Library (aka glibc) through 2.34 sysdeps/unix/sysv/linux/mq_notify.c mishandles certain NOTIFY_REMOVED data leading to a NULL pointer dereference. NOTE: this vulnerability was introduced as a side effect of the CVE-2021-33574 fix.

Scope

1 vulnerability in this advisory, including CVE-2021-38604.

CVE-2021-38604

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Fixed: 2 products Known affected: 2 products

https://learn.microsoft.com/en-us/azure/azure-linux/tutoria…

Open the full advisory

OESA-2021-1328 (CVE-2021-38604)

Vulnerability from osv_openeuler – Published: 2021-09-03 11:04 – Updated: 2026-08-06 11:04 – Source website

Summary

glibc security update

Details

The GNU C Library project provides the core libraries for the GNU system and GNU/Linux systems, as well as many other systems that use Linux as the kernel. These libraries provide critical APIs including ISO C11, POSIX.1-2008, BSD, OS-specific APIs and more. These APIs include such foundational facilities as open, read, write, malloc, printf, getaddrinfo, dlopen, pthread_create, crypt, login, exit and more.

Security Fix(es):

Severity

7.5 (High)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

URL

Type

	https://openeuler.org/en/security/safety-bulletin…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2021-38604	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "nss_modules-2.28-77.oe1.aarch64.rpm",
          "glibc-common-2.28-77.oe1.aarch64.rpm",
          "nscd-2.28-77.oe1.aarch64.rpm",
          "glibc-debugutils-2.28-77.oe1.aarch64.rpm",
          "glibc-all-langpacks-2.28-77.oe1.aarch64.rpm",
          "glibc-devel-2.28-77.oe1.aarch64.rpm",
          "libnsl-2.28-77.oe1.aarch64.rpm",
          "glibc-nss-devel-2.28-77.oe1.aarch64.rpm",
          "glibc-2.28-77.oe1.aarch64.rpm",
          "glibc-benchtests-2.28-77.oe1.aarch64.rpm",
          "glibc-locale-source-2.28-77.oe1.aarch64.rpm",
          "glibc-debuginfo-2.28-77.oe1.aarch64.rpm",
          "glibc-debugsource-2.28-77.oe1.aarch64.rpm"
        ],
        "noarch": [
          "glibc-help-2.28-77.oe1.noarch.rpm"
        ],
        "src": [
          "glibc-2.28-77.oe1.src.rpm"
        ],
        "x86_64": [
          "glibc-locale-source-2.28-77.oe1.x86_64.rpm",
          "glibc-debuginfo-2.28-77.oe1.x86_64.rpm",
          "glibc-2.28-77.oe1.x86_64.rpm",
          "nss_modules-2.28-77.oe1.x86_64.rpm",
          "libnsl-2.28-77.oe1.x86_64.rpm",
          "glibc-debugsource-2.28-77.oe1.x86_64.rpm",
          "nscd-2.28-77.oe1.x86_64.rpm",
          "glibc-benchtests-2.28-77.oe1.x86_64.rpm",
          "glibc-debugutils-2.28-77.oe1.x86_64.rpm",
          "glibc-all-langpacks-2.28-77.oe1.x86_64.rpm",
          "glibc-devel-2.28-77.oe1.x86_64.rpm",
          "glibc-common-2.28-77.oe1.x86_64.rpm",
          "glibc-nss-devel-2.28-77.oe1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP1",
        "name": "glibc",
        "purl": "pkg:rpm/openEuler/glibc\u0026distro=openEuler-20.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.28-77.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "nscd-2.28-77.oe1.aarch64.rpm",
          "glibc-devel-2.28-77.oe1.aarch64.rpm",
          "glibc-debuginfo-2.28-77.oe1.aarch64.rpm",
          "glibc-benchtests-2.28-77.oe1.aarch64.rpm",
          "glibc-nss-devel-2.28-77.oe1.aarch64.rpm",
          "nss_modules-2.28-77.oe1.aarch64.rpm",
          "glibc-all-langpacks-2.28-77.oe1.aarch64.rpm",
          "libnsl-2.28-77.oe1.aarch64.rpm",
          "glibc-2.28-77.oe1.aarch64.rpm",
          "glibc-debugsource-2.28-77.oe1.aarch64.rpm",
          "glibc-common-2.28-77.oe1.aarch64.rpm",
          "glibc-debugutils-2.28-77.oe1.aarch64.rpm",
          "glibc-locale-source-2.28-77.oe1.aarch64.rpm"
        ],
        "noarch": [
          "glibc-help-2.28-77.oe1.noarch.rpm"
        ],
        "src": [
          "glibc-2.28-77.oe1.src.rpm"
        ],
        "x86_64": [
          "libnsl-2.28-77.oe1.x86_64.rpm",
          "glibc-2.28-77.oe1.x86_64.rpm",
          "glibc-nss-devel-2.28-77.oe1.x86_64.rpm",
          "glibc-debugutils-2.28-77.oe1.x86_64.rpm",
          "glibc-devel-2.28-77.oe1.x86_64.rpm",
          "glibc-debugsource-2.28-77.oe1.x86_64.rpm",
          "nss_modules-2.28-77.oe1.x86_64.rpm",
          "glibc-all-langpacks-2.28-77.oe1.x86_64.rpm",
          "glibc-debuginfo-2.28-77.oe1.x86_64.rpm",
          "glibc-benchtests-2.28-77.oe1.x86_64.rpm",
          "nscd-2.28-77.oe1.x86_64.rpm",
          "glibc-common-2.28-77.oe1.x86_64.rpm",
          "glibc-locale-source-2.28-77.oe1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP2",
        "name": "glibc",
        "purl": "pkg:rpm/openEuler/glibc\u0026distro=openEuler-20.03-LTS-SP2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.28-77.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "The GNU C Library project provides the core libraries for the GNU system and GNU/Linux systems, as well as many other systems that use Linux as the kernel. These libraries provide critical APIs including ISO C11, POSIX.1-2008, BSD, OS-specific APIs and more. These APIs include such foundational facilities as open, read, write, malloc, printf, getaddrinfo, dlopen, pthread_create, crypt, login, exit and more.\r\n\r\nSecurity Fix(es):\r\n\r\nIn librt in the GNU C Library (aka glibc) through 2.34, sysdeps/unix/sysv/linux/mq_notify.c mishandles certain NOTIFY_REMOVED data, leading to a NULL pointer dereference. NOTE: this vulnerability was introduced as a side effect of the CVE-2021-33574 fix.(CVE-2021-38604)",
  "id": "OESA-2021-1328",
  "modified": "2026-08-06T11:04:35Z",
  "published": "2021-09-03T11:04:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1328"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-38604"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "glibc security update",
  "upstream": [
    "CVE-2021-38604"
  ]
}

SSA-398330

Vulnerability from csaf_siemens - Published: 2023-12-12 00:00 - Updated: 2026-10-13 00:00

Summary

SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5

Scope

544 vulnerabilities in this advisory, including CVE-2021-38604.

CVE-2021-38604

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C

Known affected: 5 products

https://support.industry.siemens.com/cs/ww/en/view/109478459/

Open the full advisory

SSA-831302

Vulnerability from csaf_siemens - Published: 2023-06-13 00:00 - Updated: 2024-04-09 00:00

Summary

SSA-831302: Vulnerabilities in the BIOS of the SIMATIC S7-1500 TM MFP before V1.3.0

Scope

72 vulnerabilities in this advisory, including CVE-2021-38604.

CVE-2021-38604

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C

Known affected: 1 product

https://support.industry.siemens.com/cs/ww/en/view/109945851/

Open the full advisory

UBUNTU-CVE-2021-38604 (CVE-2021-38604)

Vulnerability from osv_ubuntu – Published: 2021-08-12 16:15 – Updated: 2025-07-16 04:57 – Source website

Withdrawn 2025-07-18

Details

Severity

7.5 (High)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

7.5 (High)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2021-38604	REPORT
	https://www.cve.org/CVERecord?id=CVE-2021-38604	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "glibc-doc",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "glibc-source",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc-bin",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc-bin-dbgsym",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc-dev-bin",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc-dev-bin-dbgsym",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc-devtools",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc-devtools-dbgsym",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc6",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc6-amd64",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc6-amd64-dbgsym",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc6-dbg",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc6-dev",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc6-dev-amd64",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc6-dev-i386",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc6-dev-s390",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc6-dev-x32",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc6-i386",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc6-i386-dbgsym",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc6-prof",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc6-s390",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc6-s390-dbgsym",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc6-x32",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "libc6-x32-dbgsym",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "locales",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "locales-all",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "nscd",
            "binary_version": "2.34-0ubuntu3"
          },
          {
            "binary_name": "nscd-dbgsym",
            "binary_version": "2.34-0ubuntu3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "glibc",
        "purl": "pkg:deb/ubuntu/glibc@2.34-0ubuntu3?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.34-0ubuntu3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [],
  "details": "In librt in the GNU C Library (aka glibc) through 2.34, sysdeps/unix/sysv/linux/mq_notify.c mishandles certain NOTIFY_REMOVED data, leading to a NULL pointer dereference. NOTE: this vulnerability was introduced as a side effect of the CVE-2021-33574 fix.",
  "id": "UBUNTU-CVE-2021-38604",
  "modified": "2025-07-16T04:57:28Z",
  "published": "2021-08-12T16:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-38604"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-38604"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-38604"
  ],
  "withdrawn": "2025-07-18T16:46:57Z"
}

WID-SEC-W-2023-1432

Vulnerability from csaf_certbund - Published: 2023-06-12 22:00 - Updated: 2023-06-22 22:00

Summary

Siemens SIMATIC S7: Mehrere Schwachstellen

Severity

Kritisch

Scope

149 vulnerabilities in this advisory, including CVE-2021-38604.

CVE-2021-38604

In Siemens SIMATIC S7 existieren mehrere Schwachstellen. Die Fehler bestehen unter anderem aufgrund von unzulässigen Einschränkungen, Pufferüberläufen, fehlenden Freigaben und use-after-free-Problemen. Ein Angreifer kann diese Schwachstellen ausnutzen, um beliebigen Code auszuführen, Sicherheitsmaßnahmen zu umgehen, vertrauliche Informationen offenzulegen, einen Denial-of-Service-Zustand herbeizuführen, seine Privilegien zu erweitern und Daten zu manipulieren. Die erfolgreiche Ausnutzung einiger dieser Schwachstellen erfordert eine Benutzerinteraktion oder erhöhte Privilegien.

Known affected: 2 products

Open the full advisory

WID-SEC-W-2023-3051

Vulnerability from csaf_certbund - Published: 2021-08-12 22:00 - Updated: 2023-12-04 23:00

Summary

GNU libc: Schwachstelle ermöglicht nicht spezifizierten Angriff

Severity

Mittel

Scope

1 vulnerability in this advisory, including CVE-2021-38604.

CVE-2021-38604

Es existiert eine Schwachstelle in GNU libc in der Funktion "sysdeps/unix/sysv/linux/mq_notify.c". Der Fehler basiert auf einem fehlerhaften Umgang mit bestimmten Daten wodurch eine Null-Zeiger-Dereferenzierung auftritt. Ein lokaler Angreifer kann diese Schwachstelle ausnutzen, um nicht näher spezifizierte Auswirkungen zu verursachen.

Known affected: 1 product

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

Publication & reservation Sightings KEV catalogs Other timestamps

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2021-38604 (GCVE-0-2021-38604)

ICSA-23-166-10

ICSA-23-348-10

MSRC_CVE-2021-38604

OESA-2021-1328 (CVE-2021-38604)

SSA-398330

SSA-831302

UBUNTU-CVE-2021-38604 (CVE-2021-38604)

WID-SEC-W-2023-1432

WID-SEC-W-2023-3051

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour