GNU C Library __vsyslog_internal heap-based overflow

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.7$0-$5k0.00

Summaryinfo

A vulnerability has been found in GNU C Library and classified as critical. This impacts the function __vsyslog_internal. The manipulation leads to heap-based overflow. This vulnerability is uniquely identified as CVE-2023-6779. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in GNU C Library (Software Library) (the affected version unknown) and classified as critical. This issue affects the function __vsyslog_internal. The manipulation with an unknown input leads to a heap-based overflow vulnerability. Using CWE to declare the problem leads to CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). Impacted is confidentiality, integrity, and availability.

The weakness was disclosed 01/31/2024. The advisory is shared at bugzilla.redhat.com. The identification of this vulnerability is CVE-2023-6779 since 12/13/2023. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/01/2025).

The vulnerability scanner Nessus provides a plugin with the ID 239976 (TencentOS Server 4: glibc (TSSA-2024:0581)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (239976), EUVD (EUVD-2023-58991) and CERT Bund (WID-SEC-2024-0246). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

  • Ubuntu Linux
  • Gentoo Linux
  • Siemens SIMATIC S7
  • Open Source GNU libc
  • Dell Avamar
  • Dell integrated Dell Remote Access Controller

Productinfo

Type

Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.7
VulDB Meta Temp Score: 7.7

VulDB Base Score: 7.3
VulDB Temp Score: 7.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CNA Base Score: 8.2
CNA Vector (Red Hat, Inc.): 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Heap-based overflow
CWE: CWE-122 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 239976
Nessus Name: TencentOS Server 4: glibc (TSSA-2024:0581)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

12/13/2023 🔍
01/31/2024 +49 days 🔍
01/31/2024 +0 days 🔍
09/01/2025 +579 days 🔍

Sourcesinfo

Vendor: gnu.org

Advisory: 176932
Status: Not defined

CVE: CVE-2023-6779 (🔍)
GCVE (CVE): GCVE-0-2023-6779
GCVE (VulDB): GCVE-100-252437
EUVD: 🔍
CERT Bund: WID-SEC-2024-0246 - GNU libc: Mehrere Schwachstellen

Entryinfo

Created: 01/31/2024 01:47
Updated: 09/01/2025 17:40
Changes: 01/31/2024 01:47 (37), 02/22/2024 10:09 (2), 02/22/2024 10:15 (21), 06/13/2025 19:12 (16), 06/17/2025 20:34 (2), 09/01/2025 17:40 (7)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Do you need the next level of professionalism?

Upgrade your account now!