GNU C Library getaddrinfo use after free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.4$0-$5k0.00

Summaryinfo

A vulnerability described as critical has been identified in GNU C Library. This affects the function getaddrinfo. The manipulation results in use after free. This vulnerability was named CVE-2023-4806. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as critical, was found in GNU C Library (Software Library) (unknown version). Affected is the function getaddrinfo. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

A flaw has been identified in glibc. In an extremely rare situation, the getaddrinfo function may access memory that has been freed, resulting in an application crash. This issue is only exploitable when a NSS module implements only the _nss_*_gethostbyname2_r and _nss_*_getcanonname_r hooks without implementing the _nss_*_gethostbyname3_r hook. The resolved name should return a large number of IPv6 and IPv4, and the call to the getaddrinfo function should have the AF_INET6 address family with AI_CANONNAME, AI_ALL and AI_V4MAPPED as flags.

The weakness was presented 09/12/2023. The advisory is available at bugzilla.redhat.com. This vulnerability is traded as CVE-2023-4806 since 09/06/2023. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 07/15/2026).

The vulnerability scanner Nessus provides a plugin with the ID 215876 (Azure Linux 3.0 Security Update: glibc (CVE-2023-5156)), 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 vulnerability database at Tenable (215876). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.4

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

NVD Base Score: 5.9
NVD Vector: 🔍

CNA Base Score: 5.9
CNA Vector (Red Hat, Inc.): 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 215876
Nessus Name: Azure Linux 3.0 Security Update: glibc (CVE-2023-5156)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

09/06/2023 🔍
09/12/2023 +6 days 🔍
09/12/2023 +0 days 🔍
07/15/2026 +1037 days 🔍

Sourcesinfo

Vendor: gnu.org

Advisory: RHSA-2023:5453
Status: Not defined

CVE: CVE-2023-4806 (🔍)
GCVE (CVE): GCVE-0-2023-4806
GCVE (VulDB): GCVE-100-239538

Entryinfo

Created: 09/12/2023 19:19
Updated: 07/15/2026 07:48
Changes: 09/12/2023 19:19 (36), 10/05/2023 13:42 (1), 10/10/2023 14:49 (2), 10/10/2023 14:50 (12), 09/16/2024 17:30 (27), 02/12/2025 01:36 (2), 07/15/2026 07:48 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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