Vulnerability-Lookup

CVE-2021-33574 (GCVE-0-2021-33574)

Vulnerability from cvelistv5 – Published: 2021-05-25 00:00 – Updated: 2026-10-14 11:44

Summary

The mq_notify function in the GNU C Library (aka glibc) versions 2.32 and 2.33 has a use-after-free. It may use the notification thread attributes object (passed through its struct sigevent parameter) after it has been freed by the caller, leading to a denial of service (application crash) or possibly unspecified other impact.

Severity

9.8 (Critical)


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

CWE

Assigner

mitre CNA under the mitre root

CNA scorecard E 29/100 over 2193 records in the last 180 days details

References

9 references

URL	Tags
https://sourceware.org/bugzilla/show_bug.cgi?id=27896
https://sourceware.org/bugzilla/show_bug.cgi?id=2…
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://security.netapp.com/advisory/ntap-2021062…
https://security.gentoo.org/glsa/202107-07	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.debian.org/debian-lts-announce/2022…	mailing-list
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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          },
          {
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-398330.html"
          },
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            "url": "https://cert-portal.siemens.com/productcert/html/ssa-831302.html"
          }
        ],
        "sourceIdentifier": "cve@mitre.org",
        "vulnStatus": "Modified",
        "weaknesses": [
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            ],
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    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-11-07T13:26:17+00:00",
      "cve": "CVE-2021-33574",
      "id": "CVE-2021-33574",
      "initial_release_date": "2021-05-21T00:00:00+00:00",
      "product_status:fixed": "882",
      "product_status:known_affected": "21",
      "product_status:known_not_affected": "216",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "glibc: mq_notify does not handle separately allocated thread attributes",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-33574.json",
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}

GHSA-RX5M-J84J-22PG

Vulnerability from github – Published: 2022-05-24 19:03 – Updated: 2026-10-14 12:31

Details

The mq_notify function in the GNU C Library (aka glibc) through 2.33 has a use-after-free. It may use the notification thread attributes object (passed through its struct sigevent parameter) after it has been freed by the caller, leading to a denial of service (application crash) or possibly unspecified other impact.

Severity

9.8 (Critical)


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

Show details on source website

JSON

To clipboard

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    "github_reviewed": false,
    "github_reviewed_at": null,
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    "severity": "CRITICAL"
  },
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  "id": "GHSA-rx5m-j84j-22pg",
  "modified": "2026-10-14T12:31:19Z",
  "published": "2022-05-24T19:03:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-33574"
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      "type": "CVSS_V3"
    }
  ]
}

GSD-2021-33574

Vulnerability from gsd - Updated: 2023-12-13 01:23

Details

Aliases

CVE-2021-33574

Aliases

CVE-2021-33574

JSON

To clipboard

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    "id": "GSD-2021-33574",
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      "https://advisories.mageia.org/CVE-2021-33574.html",
      "https://security.archlinux.org/CVE-2021-33574",
      "https://linux.oracle.com/cve/CVE-2021-33574.html"
    ]
  },
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              "name": "FEDORA-2021-f29b4643c7",
              "refsource": "FEDORA",
              "tags": [
                "Mailing List",
                "Third Party Advisory"
              ],
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KJYYIMDDYOHTP2PORLABTOHYQYYREZDD/"
            },
            {
              "name": "[debian-lts-announce] 20221017 [SECURITY] [DLA 3152-1] glibc security update",
              "refsource": "MLIST",
              "tags": [
                "Mailing List",
                "Third Party Advisory"
              ],
              "url": "https://lists.debian.org/debian-lts-announce/2022/10/msg00021.html"
            }
          ]
        }
      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 7.5,
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
            "version": "2.0"
          },
          "exploitabilityScore": 10.0,
          "impactScore": 6.4,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "HIGH",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 5.9
        }
      },
      "lastModifiedDate": "2022-11-08T13:27Z",
      "publishedDate": "2021-05-25T22:15Z"
    }
  }
}

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-2021-33574.

CVE-2021-33574

9.8 (Critical)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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-2021-33574.

CVE-2021-33574

9.8 (Critical)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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-2021-33574

Vulnerability from csaf_microsoft - Published: 2021-05-02 00:00 - Updated: 2021-06-02 00:00

Summary

The mq_notify function in the GNU C Library (aka glibc) versions 2.32 and 2.33 has a use-after-free. It may use the notification thread attributes object (passed through its struct sigevent parameter) after it has been freed by the caller leading to a denial of service (application crash) or possibly unspecified other impact.

Scope

1 vulnerability in this advisory, including CVE-2021-33574.

CVE-2021-33574

9.8 (Critical)


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

Fixed: 1 product Known affected: 1 product

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

Open the full advisory

OESA-2021-1239 (CVE-2021-33574)

Vulnerability from osv_openeuler – Published: 2021-06-26 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

9.8 (Critical)


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

References

URL

Type

	https://openeuler.org/en/security/safety-bulletin…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2021-33574	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "libnsl-2.28-69.oe1.aarch64.rpm",
          "glibc-all-langpacks-2.28-69.oe1.aarch64.rpm",
          "glibc-benchtests-2.28-69.oe1.aarch64.rpm",
          "glibc-2.28-69.oe1.aarch64.rpm",
          "glibc-debugutils-2.28-69.oe1.aarch64.rpm",
          "glibc-common-2.28-69.oe1.aarch64.rpm",
          "nss_modules-2.28-69.oe1.aarch64.rpm",
          "glibc-locale-source-2.28-69.oe1.aarch64.rpm",
          "glibc-devel-2.28-69.oe1.aarch64.rpm",
          "glibc-debuginfo-2.28-69.oe1.aarch64.rpm",
          "glibc-nss-devel-2.28-69.oe1.aarch64.rpm",
          "nscd-2.28-69.oe1.aarch64.rpm",
          "glibc-debugsource-2.28-69.oe1.aarch64.rpm"
        ],
        "noarch": [
          "glibc-help-2.28-69.oe1.noarch.rpm"
        ],
        "src": [
          "glibc-2.28-69.oe1.src.rpm"
        ],
        "x86_64": [
          "glibc-devel-2.28-69.oe1.x86_64.rpm",
          "glibc-common-2.28-69.oe1.x86_64.rpm",
          "glibc-debugutils-2.28-69.oe1.x86_64.rpm",
          "glibc-2.28-69.oe1.x86_64.rpm",
          "glibc-benchtests-2.28-69.oe1.x86_64.rpm",
          "glibc-all-langpacks-2.28-69.oe1.x86_64.rpm",
          "glibc-debugsource-2.28-69.oe1.x86_64.rpm",
          "nss_modules-2.28-69.oe1.x86_64.rpm",
          "nscd-2.28-69.oe1.x86_64.rpm",
          "glibc-nss-devel-2.28-69.oe1.x86_64.rpm",
          "glibc-debuginfo-2.28-69.oe1.x86_64.rpm",
          "glibc-locale-source-2.28-69.oe1.x86_64.rpm",
          "libnsl-2.28-69.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": "2.28-69.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Critical"
  },
  "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\nThe mq_notify function in the GNU C Library (aka glibc) versions 2.32 and 2.33 has a use-after-free. It may use the notification thread attributes object (passed through its struct sigevent parameter) after it has been freed by the caller, leading to a denial of service (application crash) or possibly unspecified other impact.(CVE-2021-33574)",
  "id": "OESA-2021-1239",
  "modified": "2026-08-06T11:04:28Z",
  "published": "2021-06-26T11:04:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1239"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-33574"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "glibc security update",
  "upstream": [
    "CVE-2021-33574"
  ]
}

OPENSUSE-SU-2021:1374-1

Vulnerability from csaf_opensuse - Published: 2021-10-18 14:06 - Updated: 2026-09-20 19:29

Summary

Security update for glibc

Severity

Moderate

Scope

2 vulnerabilities in this advisory, including CVE-2021-33574.

CVE-2021-33574

5.9 (Medium)


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

Recommended: 33 products

Open the full advisory

OPENSUSE-SU-2021:3291-1

Vulnerability from csaf_opensuse - Published: 2021-12-08 15:40 - Updated: 2026-09-20 19:35

Summary

Security update for glibc

Severity

Moderate

Scope

2 vulnerabilities in this advisory, including CVE-2021-33574.

CVE-2021-33574

5.9 (Medium)


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

Recommended: 46 products

Open the full advisory

OPENSUSE-SU-2024:10792-1

Vulnerability from csaf_opensuse - Published: 2024-06-15 00:00 - Updated: 2026-10-18 10:25

Summary

glibc-2.34-1.2 on GA media

Severity

Moderate

Scope

34 vulnerabilities in this advisory, including CVE-2021-33574.

CVE-2021-33574

5.9 (Medium)


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

Recommended: 48 products

Open the full advisory

RHSA-2021:4358

Vulnerability from csaf_redhat - Published: 2021-11-09 18:06 - Updated: 2026-10-14 13:39

Summary

Red Hat Security Advisory: glibc security, bug fix, and enhancement update

Severity

Moderate

Scope

3 vulnerabilities in this advisory, including CVE-2021-33574.

CVE-2021-33574

The mq_notify function in the GNU C Library (aka glibc) has a use-after-free. It may use the notification thread attributes object (passed through its struct sigevent parameter) after it has been freed by the caller, leading to a denial of service (application crash) or possibly unspecified other impact.

5.9 (Medium)


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

Fixed: 882 products

https://access.redhat.com/errata/RHSA-2021:4358

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

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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.

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CVE-2021-33574 (GCVE-0-2021-33574)

OESA-2021-1239 (CVE-2021-33574)

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Related by attack behaviour