// For flags

CVE-2024-12705

DNS-over-HTTPS implementation suffers from multiple issues under heavy query load

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Attend
*SSVC
Descriptions

Clients using DNS-over-HTTPS (DoH) can exhaust a DNS resolver's CPU and/or memory by flooding it with crafted valid or invalid HTTP/2 traffic.
This issue affects BIND 9 versions 9.18.0 through 9.18.32, 9.20.0 through 9.20.4, 9.21.0 through 9.21.3, and 9.18.11-S1 through 9.18.32-S1.

A flaw was found in BIND 9. By flooding a target resolver with HTTP/2 traffic and exploiting this flaw, an attacker could overwhelm the server, causing high CPU and/or memory usage and preventing other clients from establishing DoH connections. This issue could significantly impair the resolver's performance and effectively deny legitimate clients access to the DNS resolution service.

Clients using DNS-over-HTTPS (DoH) can exhaust a DNS resolver's CPU and/or memory by flooding it with crafted valid or invalid HTTP/2 traffic. This issue affects BIND 9 versions 9.18.0 through 9.18.32, 9.20.0 through 9.20.4, 9.21.0 through 9.21.3, and 9.18.11-S1 through 9.18.32-S1.

Toshifumi Sakaguchi discovered that Bind incorrectly handled many records in the additional section. A remote attacker could possibly use this issue to cause Bind to consume CPU resources, leading to a denial of service. Jean-François Billaud discovered that the Bind DNS-over-HTTPS implementation incorrectly handled a heavy query load. A remote attacker could possibly use this issue to cause Bind to consume resources, leading to a denial of service.

*Credits: ISC would like to thank Jean-François Billaud for bringing this vulnerability to our attention.
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Complete
* Common Vulnerability Scoring System
SSVC
  • Decision:Attend
Exploitation
None
Automatable
Yes
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-12-17 CVE Reserved
  • 2025-01-29 CVE Published
  • 2025-02-07 CVE Updated
  • 2025-07-19 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-400: Uncontrolled Resource Consumption
  • CWE-770: Allocation of Resources Without Limits or Throttling
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
ISC
Search vendor "ISC"
 BIND 9
Search vendor "ISC" for product "BIND 9"
 >= 9.18.0 <= 9.18.32
Search vendor "ISC" for product "BIND 9" and version " >= 9.18.0 <= 9.18.32"
en
Affected
ISC
Search vendor "ISC"
 BIND 9
Search vendor "ISC" for product "BIND 9"
 >= 9.20.0 <= 9.20.4
Search vendor "ISC" for product "BIND 9" and version " >= 9.20.0 <= 9.20.4"
en
Affected
ISC
Search vendor "ISC"
 BIND 9
Search vendor "ISC" for product "BIND 9"
 >= 9.21.0 <= 9.21.3
Search vendor "ISC" for product "BIND 9" and version " >= 9.21.0 <= 9.21.3"
en
Affected