ISC BIND up to 9.21.21 Zone amplification

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.
5.3$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic has been found in ISC BIND up to 9.21.21. This affects an unknown function of the component Zone Handler. This manipulation causes amplification. This vulnerability is tracked as CVE-2026-3592. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in ISC BIND up to 9.21.21. It has been declared as problematic. Affected by this vulnerability is some unknown processing of the component Zone Handler. The manipulation with an unknown input leads to a amplification vulnerability. The CWE definition for the vulnerability is CWE-408. The product allows an entity to perform a legitimate but expensive operation before authentication or authorization has taken place. As an impact it is known to affect availability. The summary by CVE is:

BIND resolvers are vulnerable to an amplified resource consumption/exhaustion attack. If a victim resolver makes a query to a specially crafted zone, the resolver will consume disproportionate resources. This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.

It is possible to read the advisory at kb.isc.org. This vulnerability is known as CVE-2026-3592 since 03/05/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/05/2026). The attack technique deployed by this issue is T1499.002 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 315942 (Debian dsa-6285 : bind9 - security update), 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 (315942) and CERT Bund (WID-SEC-2026-1626). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

  • Debian Linux
  • Red Hat Enterprise Linux
  • Fedora Linux
  • Ubuntu Linux
  • Oracle Linux
  • Infoblox NIOS
  • SUSE openSUSE
  • Internet Systems Consortium BIND

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.3
CNA Vector (isc): 🔒

CVSSv2info

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

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

Exploitinginfo

Class: Amplification
CWE: CWE-408 / CWE-405 / CWE-400
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: 315942
Nessus Name: Debian dsa-6285 : bind9 - security update

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

03/05/2026 CVE reserved
05/20/2026 +75 days Advisory disclosed
05/20/2026 +0 days VulDB entry created
06/05/2026 +16 days VulDB entry last update

Sourcesinfo

Vendor: isc.org

Advisory: kb.isc.org
Status: Confirmed

CVE: CVE-2026-3592 (🔒)
GCVE (CVE): GCVE-0-2026-3592
GCVE (VulDB): GCVE-100-364867
CERT Bund: WID-SEC-2026-1626 - Internet Systems Consortium BIND: Mehrere Schwachstellen

Entryinfo

Created: 05/20/2026 15:31
Updated: 06/05/2026 14:31
Changes: 05/20/2026 15:31 (62), 05/21/2026 13:03 (2), 05/21/2026 13:15 (7), 05/26/2026 15:40 (1), 06/05/2026 14:31 (1)
Complete: 🔍
Cache ID: 216::103

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

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Want to know what is going to be exploited?

We predict KEV entries!