Vulnerability-Lookup

CVE-2023-6779 (GCVE-0-2023-6779)

Vulnerability from cvelistv5 – Published: 2024-01-31 14:07 – Updated: 2026-07-14 12:03

Title

Glibc: off-by-one heap-based buffer overflow in __vsyslog_internal()

Summary

An off-by-one heap-based buffer overflow was found in the __vsyslog_internal function of the glibc library. This function is called by the syslog and vsyslog functions. This issue occurs when these functions are called with a message bigger than INT_MAX bytes, leading to an incorrect calculation of the buffer size to store the message, resulting in an application crash. This issue affects glibc 2.37 and newer.

Severity

8.2 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-06-13 16:08 UTC

CWE

CWE-122 - Heap-based Buffer Overflow

Assigner

redhat redhat root

References

11 references

URL	Tags
http://packetstormsecurity.com/files/176932/glibc…
http://seclists.org/fulldisclosure/2024/Feb/3
https://access.redhat.com/security/cve/CVE-2023-6779	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2254395	issue-trackingx_refsource_REDHAT
https://lists.fedoraproject.org/archives/list/pac…
https://lists.fedoraproject.org/archives/list/pac…
https://security.gentoo.org/glsa/202402-01
https://www.openwall.com/lists/oss-security/2024/…
https://www.qualys.com/2024/01/30/cve-2023-6246/s…
https://security.netapp.com/advisory/ntap-2024022…
https://cert-portal.siemens.com/productcert/html/…

Impacted products

9 products

Vendor	Product	Version	CPE status
n/a	glibc	Unaffected: 2.39
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9
Fedora	Fedora		guessed
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.5 , < * (custom)	guessed
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP	Affected: V3.1.5 , < * (custom)	guessed
Siemens	SIPLUS S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.5 , < * (custom)	guessed

Date Public

2024-01-30 00:00

Credits

Red Hat would like to thank Qualys Threat Research Unit for reporting this issue.

Show details on NVD website

JSON

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GSD-2023-6779

Vulnerability from gsd - Updated: 2023-12-14 06:01

Details

Aliases

CVE-2023-6779

JSON

To clipboard

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    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
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        "CVE-2023-6779"
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      "id": "GSD-2023-6779",
      "modified": "2023-12-14T06:01:34.781534Z",
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ICSA-25-162-05

Vulnerability from csaf_cisa - Published: 2025-06-10 00:00 - Updated: 2026-05-14 06:00

Summary

Siemens SIMATIC S7-1500 CPU family

Scope

149 vulnerabilities in this advisory, including CVE-2023-6779.

CVE-2023-6779

7.5 (High)


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

Known affected: 5 products

Open the full advisory

MSRC_CVE-2023-6779

Vulnerability from csaf_microsoft - Published: 2024-01-01 08:00 - Updated: 2026-02-18 14:04

Summary

Glibc: off-by-one heap-based buffer overflow in __vsyslog_internal()

Scope

1 vulnerability in this advisory, including CVE-2023-6779.

CVE-2023-6779

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

NCSC-2025-0187

Vulnerability from csaf_ncscnl - Published: 2025-06-10 13:11 - Updated: 2025-06-10 13:11

Summary

Kwetsbaarheden verholpen in Siemens producten

Scope

70 vulnerabilities in this advisory, including CVE-2023-6779.

CVE-2023-6779

8.2 (High)


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

Known affected: 99 products

Open the full advisory

SSA-082556

Vulnerability from csaf_siemens - Published: 2025-06-10 00:00 - Updated: 2026-07-14 00:00

Summary

SSA-082556: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP V3.1.5

Scope

316 vulnerabilities in this advisory, including CVE-2023-6779.

CVE-2023-6779

8.2 (High)


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

Known affected: 5 products

Open the full advisory

ubuntu-cve-2023-6779

Vulnerability from osv_ubuntu

Published

2024-01-31 00:00

Modified

2026-04-22 07:45

Summary

Details

Severity

7.5 (High)


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

8.2 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2023-6779	REPORT
	https://www.qualys.com/2024/01/30/cve-2023-6246/s…	REPORT
	https://ubuntu.com/security/notices/USN-6620-1	ADVISORY
	https://www.cve.org/CVERecord?id=CVE-2023-6779	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "glibc-source",
            "binary_version": "2.39-0ubuntu1"
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            "binary_name": "libc-bin",
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  "published": "2024-01-31T00:00:00Z",
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}

usn-6620-1

Vulnerability from osv_ubuntu

Published

2024-02-01 12:41

Modified

2024-02-01 12:41

Summary

glibc vulnerabilities

Details

It was discovered that the GNU C Library incorrectly handled the syslog() function call. A local attacker could use this issue to execute arbitrary code and possibly escalate privileges.

References

URL

Type

	https://ubuntu.com/security/notices/USN-6620-1	ADVISORY
	https://ubuntu.com/security/CVE-2023-6246	REPORT
	https://ubuntu.com/security/CVE-2023-6779	REPORT
	https://ubuntu.com/security/CVE-2023-6780	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "glibc-doc",
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          {
            "binary_name": "libc6-dbg",
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          {
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            "binary_version": "2.38-1ubuntu6.1"
          },
          {
            "binary_name": "libc6-prof",
            "binary_version": "2.38-1ubuntu6.1"
          },
          {
            "binary_name": "libc6-s390",
            "binary_version": "2.38-1ubuntu6.1"
          },
          {
            "binary_name": "libc6-s390-dbgsym",
            "binary_version": "2.38-1ubuntu6.1"
          },
          {
            "binary_name": "libc6-x32",
            "binary_version": "2.38-1ubuntu6.1"
          },
          {
            "binary_name": "libc6-x32-dbgsym",
            "binary_version": "2.38-1ubuntu6.1"
          },
          {
            "binary_name": "locales",
            "binary_version": "2.38-1ubuntu6.1"
          },
          {
            "binary_name": "locales-all",
            "binary_version": "2.38-1ubuntu6.1"
          },
          {
            "binary_name": "nscd",
            "binary_version": "2.38-1ubuntu6.1"
          },
          {
            "binary_name": "nscd-dbgsym",
            "binary_version": "2.38-1ubuntu6.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:23.10",
        "name": "glibc",
        "purl": "pkg:deb/ubuntu/glibc@2.38-1ubuntu6.1?arch=source\u0026distro=mantic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.38-1ubuntu6.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.37-0ubuntu2",
        "2.38-1ubuntu3",
        "2.38-1ubuntu4",
        "2.38-1ubuntu5",
        "2.38-1ubuntu6"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that the GNU C Library incorrectly handled the syslog()\nfunction call. A local attacker could use this issue to execute arbitrary\ncode and possibly escalate privileges.\n",
  "id": "USN-6620-1",
  "modified": "2024-02-01T12:41:59.243886Z",
  "published": "2024-02-01T12:41:59.243886Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-6620-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2023-6246"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2023-6779"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2023-6780"
    }
  ],
  "related": [
    "CVE-2023-6246",
    "UBUNTU-CVE-2023-6246",
    "CVE-2023-6779",
    "UBUNTU-CVE-2023-6779",
    "CVE-2023-6780",
    "UBUNTU-CVE-2023-6780"
  ],
  "schema_version": "1.6.3",
  "summary": "glibc vulnerabilities"
}

WID-SEC-W-2024-0246

Vulnerability from csaf_certbund - Published: 2024-01-30 23:00 - Updated: 2025-10-13 22:00

Summary

GNU libc: Mehrere Schwachstellen

Severity

Hoch

Scope

3 vulnerabilities in this advisory, including CVE-2023-6779.

CVE-2023-6779

Known affected: 8 products

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.

Detection rules are retrieved from Rulezet.

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.

Action not permitted

CVE-2023-6779 (GCVE-0-2023-6779)

Vulnerability from osv_ubuntu

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature