Vulnerability-Lookup

GHSA-VFCH-2FR8-R5C2

Vulnerability from github – Published: 2022-08-25 00:00 – Updated: 2026-10-14 12:31

Details

A flaw was found in glibc. An off-by-one buffer overflow and underflow in getcwd() may lead to memory corruption when the size of the buffer is exactly 1. A local attacker who can control the input buffer and size passed to getcwd() in a setuid program could use this flaw to potentially execute arbitrary code and escalate their privileges on the system.

Severity

7.8 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2021-3999"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-193"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2022-08-24T16:15:00Z",
    "severity": "HIGH"
  },
  "details": "A flaw was found in glibc. An off-by-one buffer overflow and underflow in getcwd() may lead to memory corruption when the size of the buffer is exactly 1. A local attacker who can control the input buffer and size passed to getcwd() in a setuid program could use this flaw to potentially execute arbitrary code and escalate their privileges on the system.",
  "id": "GHSA-vfch-2fr8-r5c2",
  "modified": "2026-10-14T12:31:24Z",
  "published": "2022-08-25T00:00:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-3999"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2022:0896"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2021-3999"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2024637"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-398330.html"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-831302.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2022/10/msg00021.html"
    },
    {
      "type": "WEB",
      "url": "https://security-tracker.debian.org/tracker/CVE-2021-3999"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20221104-0001"
    },
    {
      "type": "WEB",
      "url": "https://sourceware.org/bugzilla/show_bug.cgi?id=28769"
    },
    {
      "type": "WEB",
      "url": "https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=23e0e8f5f1fb5ed150253d986ecccdc90c2dcd5e"
    },
    {
      "type": "WEB",
      "url": "https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=23e0e8f5f1fb5ed150253d986ecccdc90c2dcd5e"
    },
    {
      "type": "WEB",
      "url": "https://www.openwall.com/lists/oss-security/2022/01/24/4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2021-3999 (GCVE-0-2021-3999)

Vulnerability from cvelistv5 – Published: 2022-08-24 00:00 – Updated: 2026-10-14 09:59

Summary

Severity

7.8 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-12-02 20:54 UTC

CWE

CWE-193 - - Off-by-one Error

Assigner

redhat CNA under the redhat root

CNA scorecard B 81/100 over 1011 records in the last 180 days details

References

10 references

URL	Tags
https://www.openwall.com/lists/oss-security/2022/…
https://sourceware.org/bugzilla/show_bug.cgi?id=28769
https://sourceware.org/git/gitweb.cgi?p=glibc.git…
https://bugzilla.redhat.com/show_bug.cgi?id=2024637
https://access.redhat.com/security/cve/CVE-2021-3999
https://security-tracker.debian.org/tracker/CVE-2…
https://lists.debian.org/debian-lts-announce/2022…	mailing-list
https://security.netapp.com/advisory/ntap-2022110…
https://cert-portal.siemens.com/productcert/html/…
https://cert-portal.siemens.com/productcert/html/…

Impacted products

4 products

Vendor	Product	Version
n/a	glibc	Affected: Fixed in glibc v2.31 and above.
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)

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JSON

To clipboard

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              "confidentialityImpact": "HIGH",
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        "providerMetadata": {
          "dateUpdated": "2026-10-14T09:59:03.285Z",
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        },
        "references": [
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            "url": "https://cert-portal.siemens.com/productcert/html/ssa-831302.html"
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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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