SmartDNS up to 41 dns.c _dns_encode_domain out-of-bounds write

CVSS Meta Temp Score
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CTI Interest Score
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8.9$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in SmartDNS up to 41. The affected element is the function _dns_encode_domain of the file dns.c of the component DNS Handler. Performing a manipulation results in out-of-bounds write. This vulnerability is cataloged as CVE-2023-31470. It is possible to initiate the attack remotely. There is no exploit available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability, which was classified as critical, was found in SmartDNS up to 41. This affects the function _dns_encode_domain of the file dns.c of the component DNS Handler. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. CWE is classifying the issue as CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

SmartDNS through 41 before 56d0332 allows an out-of-bounds write because of a stack-based buffer overflow in the _dns_encode_domain function in the dns.c file, via a crafted DNS request.

The weakness was shared 04/29/2023 as 1378. It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2023-31470 since 04/28/2023. Technical details of the vulnerability are known, but there is no available exploit.

Applying the patch 56d0332bf91104cfc877635f6c82e9348587df04 is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2023-35775). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.0
VulDB Meta Temp Score: 8.9

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CNA Base Score: 9.8
CNA Vector: 🔍

CVSSv2info

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

Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / 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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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: 56d0332bf91104cfc877635f6c82e9348587df04

Timelineinfo

04/28/2023 🔍
04/29/2023 +1 days 🔍
04/29/2023 +0 days 🔍
12/25/2025 +971 days 🔍

Sourcesinfo

Advisory: 1378
Status: Confirmed

CVE: CVE-2023-31470 (🔍)
GCVE (CVE): GCVE-0-2023-31470
GCVE (VulDB): GCVE-100-227739
EUVD: 🔍

Entryinfo

Created: 04/29/2023 08:31
Updated: 12/25/2025 23:18
Changes: 04/29/2023 08:31 (43), 05/24/2023 09:39 (11), 01/31/2025 17:59 (26), 12/25/2025 23:18 (1)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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