DNS Protocol Closest Encloser Proof resource consumption

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.5$0-$5k0.00

Summaryinfo

A vulnerability was found in DNS Protocol. It has been rated as critical. Impacted is an unknown function of the component Closest Encloser Proof. The manipulation leads to resource consumption. This vulnerability is documented as CVE-2023-50868. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in DNS Protocol (version unknown) and classified as critical. This issue affects an unknown function of the component Closest Encloser Proof. The manipulation with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability. The summary by CVE is:

The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance is skipped) allows remote attackers to cause a denial of service (CPU consumption for SHA-1 computations) via DNSSEC responses in a random subdomain attack, aka the "NSEC3" issue. The RFC 5155 specification implies that an algorithm must perform thousands of iterations of a hash function in certain situations.

The weakness was released 02/14/2024. The advisory is shared at nlnetlabs.nl. The identification of this vulnerability is CVE-2023-50868 since 12/14/2023. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 211316 (Fedora 41 : bind / bind-dyndb-ldap (2024-7378be30dd)), 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 (211316). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.5

VulDB Base Score: 7.5
VulDB Temp Score: 7.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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

Exploitinginfo

Class: Resource consumption
CWE: CWE-400 / CWE-404
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: 211316
Nessus Name: Fedora 41 : bind / bind-dyndb-ldap (2024-7378be30dd)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

12/14/2023 🔍
02/14/2024 +62 days 🔍
02/14/2024 +0 days 🔍
12/23/2025 +678 days 🔍

Sourcesinfo

Advisory: DLA 3736-1
Status: Not defined

CVE: CVE-2023-50868 (🔍)
GCVE (CVE): GCVE-0-2023-50868
GCVE (VulDB): GCVE-100-253841

Entryinfo

Created: 02/14/2024 17:22
Updated: 12/23/2025 23:08
Changes: 02/14/2024 17:22 (36), 03/06/2024 15:49 (1), 06/11/2024 06:12 (15), 11/15/2024 16:24 (3), 12/23/2025 23:08 (9)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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