CVE-2022-2795 Processing large delegations may severely degrade resolver performance

2022-09-2100:00:00

isc

www.cve.org

cve-2022-2795

delegations

resolver flaw

dns resolution

5.3 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

LOW

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

6.7 Medium

AI Score

Confidence

High

0.002 Low

EPSS

Percentile

56.0%

JSON

By flooding the target resolver with queries exploiting this flaw an attacker can significantly impair the resolver’s performance, effectively denying legitimate clients access to the DNS resolution service.

CNA Affected

[
  {
    "vendor": "ISC",
    "product": "BIND9",
    "versions": [
      {
        "version": "Open Source Branches 9.0 through 9.16 9.0.0 through versions before 9.16.33",
        "status": "affected"
      },
      {
        "version": "Open Source Branch 9.18 9.18.0 through versions before 9.18.7",
        "status": "affected"
      },
      {
        "version": "Supported Preview Branches 9.9-S through 9.11-S 9.9.3-S1 through versions up to and including 9.11.37-S1",
        "status": "affected"
      },
      {
        "version": "Supported Preview Branch 9.16-S 9.16.8-S1 through versions before 9.16.33-S1",
        "status": "affected"
      },
      {
        "version": "Development Branch 9.19 9.19.0 through versions before 9.19.5",
        "status": "affected"
      }
    ]
  }
]