CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:N/I:N/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
75.8%
Upon receiving each incoming request header data, Envoy will iterate over existing request headers to verify that the total size of the headers stays below a maximum limit. The implementation in versions 1.10.0 through 1.11.1 for HTTP/1.x traffic and all versions of Envoy for HTTP/2 traffic had O(n^2) performance characteristics. A remote attacker may craft a request that stays below the maximum request header size but consists of many thousands of small headers to consume CPU and result in a denial-of-service attack.
Vendor | Product | Version | CPE |
---|---|---|---|
envoyproxy | envoy | 1.0.0 | cpe:2.3:a:envoyproxy:envoy:1.0.0:*:*:*:*:*:*:* |
envoyproxy | envoy | 1.1.0 | cpe:2.3:a:envoyproxy:envoy:1.1.0:*:*:*:*:*:*:* |
envoyproxy | envoy | 1.2.0 | cpe:2.3:a:envoyproxy:envoy:1.2.0:*:*:*:*:*:*:* |
envoyproxy | envoy | 1.3.0 | cpe:2.3:a:envoyproxy:envoy:1.3.0:*:*:*:*:*:*:* |
envoyproxy | envoy | 1.4.0 | cpe:2.3:a:envoyproxy:envoy:1.4.0:*:*:*:*:*:*:* |
envoyproxy | envoy | 1.5.0 | cpe:2.3:a:envoyproxy:envoy:1.5.0:*:*:*:*:*:*:* |
envoyproxy | envoy | 1.6.0 | cpe:2.3:a:envoyproxy:envoy:1.6.0:*:*:*:*:*:*:* |
envoyproxy | envoy | 1.7.0 | cpe:2.3:a:envoyproxy:envoy:1.7.0:*:*:*:*:*:*:* |
envoyproxy | envoy | 1.7.1 | cpe:2.3:a:envoyproxy:envoy:1.7.1:*:*:*:*:*:*:* |
envoyproxy | envoy | 1.8.0 | cpe:2.3:a:envoyproxy:envoy:1.8.0:*:*:*:*:*:*:* |
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:N/I:N/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
75.8%