Vulnerability-Lookup

OESA-2021-1296 (CVE-2021-35942)

Vulnerability from osv_openeuler – Published: 2021-07-31 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):

An integer overflow flaw was found in glibc that may result in reading of arbitrary memory when wordexp is used with a specially crafted untrusted regular expression input.(CVE-2021-35942)

Severity

6.7 (Medium)


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

References

URL

Type

	https://openeuler.org/en/security/safety-bulletin…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2021-35942	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "glibc-nss-devel-2.28-73.oe1.aarch64.rpm",
          "nss_modules-2.28-73.oe1.aarch64.rpm",
          "glibc-debuginfo-2.28-73.oe1.aarch64.rpm",
          "glibc-devel-2.28-73.oe1.aarch64.rpm",
          "glibc-all-langpacks-2.28-73.oe1.aarch64.rpm",
          "glibc-debugsource-2.28-73.oe1.aarch64.rpm",
          "glibc-debugutils-2.28-73.oe1.aarch64.rpm",
          "libnsl-2.28-73.oe1.aarch64.rpm",
          "glibc-common-2.28-73.oe1.aarch64.rpm",
          "glibc-locale-source-2.28-73.oe1.aarch64.rpm",
          "nscd-2.28-73.oe1.aarch64.rpm",
          "glibc-2.28-73.oe1.aarch64.rpm",
          "glibc-benchtests-2.28-73.oe1.aarch64.rpm"
        ],
        "noarch": [
          "glibc-help-2.28-73.oe1.noarch.rpm"
        ],
        "src": [
          "glibc-2.28-73.oe1.src.rpm"
        ],
        "x86_64": [
          "nss_modules-2.28-73.oe1.x86_64.rpm",
          "glibc-all-langpacks-2.28-73.oe1.x86_64.rpm",
          "glibc-debugsource-2.28-73.oe1.x86_64.rpm",
          "glibc-2.28-73.oe1.x86_64.rpm",
          "glibc-common-2.28-73.oe1.x86_64.rpm",
          "glibc-devel-2.28-73.oe1.x86_64.rpm",
          "libnsl-2.28-73.oe1.x86_64.rpm",
          "glibc-debugutils-2.28-73.oe1.x86_64.rpm",
          "glibc-nss-devel-2.28-73.oe1.x86_64.rpm",
          "nscd-2.28-73.oe1.x86_64.rpm",
          "glibc-debuginfo-2.28-73.oe1.x86_64.rpm",
          "glibc-benchtests-2.28-73.oe1.x86_64.rpm",
          "glibc-locale-source-2.28-73.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": "2.28-73.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "glibc-debugsource-2.28-73.oe1.aarch64.rpm",
          "glibc-2.28-73.oe1.aarch64.rpm",
          "glibc-benchtests-2.28-73.oe1.aarch64.rpm",
          "glibc-nss-devel-2.28-73.oe1.aarch64.rpm",
          "nss_modules-2.28-73.oe1.aarch64.rpm",
          "glibc-devel-2.28-73.oe1.aarch64.rpm",
          "glibc-debugutils-2.28-73.oe1.aarch64.rpm",
          "glibc-all-langpacks-2.28-73.oe1.aarch64.rpm",
          "libnsl-2.28-73.oe1.aarch64.rpm",
          "nscd-2.28-73.oe1.aarch64.rpm",
          "glibc-locale-source-2.28-73.oe1.aarch64.rpm",
          "glibc-common-2.28-73.oe1.aarch64.rpm",
          "glibc-debuginfo-2.28-73.oe1.aarch64.rpm"
        ],
        "noarch": [
          "glibc-help-2.28-73.oe1.noarch.rpm"
        ],
        "src": [
          "glibc-2.28-73.oe1.src.rpm"
        ],
        "x86_64": [
          "glibc-debugutils-2.28-73.oe1.x86_64.rpm",
          "glibc-devel-2.28-73.oe1.x86_64.rpm",
          "glibc-2.28-73.oe1.x86_64.rpm",
          "glibc-locale-source-2.28-73.oe1.x86_64.rpm",
          "glibc-debugsource-2.28-73.oe1.x86_64.rpm",
          "glibc-debuginfo-2.28-73.oe1.x86_64.rpm",
          "glibc-all-langpacks-2.28-73.oe1.x86_64.rpm",
          "nscd-2.28-73.oe1.x86_64.rpm",
          "glibc-common-2.28-73.oe1.x86_64.rpm",
          "glibc-nss-devel-2.28-73.oe1.x86_64.rpm",
          "libnsl-2.28-73.oe1.x86_64.rpm",
          "glibc-benchtests-2.28-73.oe1.x86_64.rpm",
          "nss_modules-2.28-73.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": "2.28-73.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Medium"
  },
  "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\nAn integer overflow flaw was found in glibc that may result in reading of arbitrary memory when wordexp is used with a specially crafted untrusted regular expression input.(CVE-2021-35942)",
  "id": "OESA-2021-1296",
  "modified": "2026-08-06T11:04:32Z",
  "published": "2021-07-31T11:04:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1296"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-35942"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "glibc security update",
  "upstream": [
    "CVE-2021-35942"
  ]
}

CVE-2021-35942 (GCVE-0-2021-35942)

Vulnerability from cvelistv5 – Published: 2021-07-22 00:00 – Updated: 2026-10-14 11:48

Summary

The wordexp function in the GNU C Library (aka glibc) through 2.33 may crash or read arbitrary memory in parse_param (in posix/wordexp.c) when called with an untrusted, crafted pattern, potentially resulting in a denial of service or disclosure of information. This occurs because atoi was used but strtoul should have been used to ensure correct calculations.

Severity

9.1 (Critical)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-02-13 20:00 UTC

CWE

n/a
CWE-704 - Incorrect Type Conversion or Cast

Assigner

mitre CNA under the mitre root

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

References

8 references

URL	Tags
https://sourceware.org/glibc/wiki/Security%20Exceptions
https://sourceware.org/bugzilla/show_bug.cgi?id=28011
https://sourceware.org/git/?p=glibc.git%3Ba=commi…
https://security.netapp.com/advisory/ntap-2021082…
https://security.gentoo.org/glsa/202208-24	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
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.0 , < V3.1.5 (custom)
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP	Affected: V3.1.0 , < V3.1.5 (custom)
Siemens	SIPLUS S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.0 , < V3.1.5 (custom)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T00:40:47.554Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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        "references": [
          {
            "tags": [
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            "url": "https://sourceware.org/glibc/wiki/Security%20Exceptions"
          },
          {
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            "url": "https://sourceware.org/bugzilla/show_bug.cgi?id=28011"
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            "url": "https://sourceware.org/git/?p=glibc.git%3Ba=commit%3Bh=5adda61f62b77384718b4c0d8336ade8f2b4b35c"
          },
          {
            "tags": [
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            "url": "https://security.netapp.com/advisory/ntap-20210827-0005/"
          },
          {
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              "vendor-advisory",
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            "url": "https://lists.debian.org/debian-lts-announce/2022/10/msg00021.html"
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        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 9.1,
              "baseSeverity": "CRITICAL",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
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              "version": "3.1"
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          },
          {
            "other": {
              "content": {
                "id": "CVE-2021-35942",
                "options": [
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                  {
                    "Automatable": "yes"
                  },
                  {
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                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-02-13T20:00:35.745017Z",
                "version": "2.0.3"
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        "problemTypes": [
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            "descriptions": [
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                "description": "CWE-704 Incorrect Type Conversion or Cast",
                "lang": "en",
                "type": "CWE"
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            ]
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        ],
        "providerMetadata": {
          "dateUpdated": "2026-02-13T20:00:38.638Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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            "defaultStatus": "unknown",
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        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-14T11:48:50.934Z",
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        "references": [
          {
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-831302.html"
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          }
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    "cna": {
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        }
      ],
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      "providerMetadata": {
        "dateUpdated": "2022-10-17T00:00:00.000Z",
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        },
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        },
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        }
      ]
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  },
  "cveMetadata": {
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    "assignerShortName": "mitre",
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    "datePublished": "2021-07-22T00:00:00.000Z",
    "dateReserved": "2021-06-29T00:00:00.000Z",
    "dateUpdated": "2026-10-14T11:48:50.934Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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

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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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