Some HTTP/2 implementations are vulnerable to resource loops, potentially leading to a denial of service
CVE-2019-9513

7.5HIGH

Key Information:

Vendor

Apple
Status
Swiftnio
Vendor
CVE Published:
13 August 2019

Badges

👾 Exploit Exists🟡 Public PoC🟣 EPSS 81%

What is CVE-2019-9513?

Some HTTP/2 implementations are vulnerable to resource loops, potentially leading to a denial of service. The attacker creates multiple request streams and continually shuffles the priority of the streams in a way that causes substantial churn to the priority tree. This can consume excess CPU.

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

cortex9-http2-priority-churn-cost-model
Created by federiconbaez

References

https://kb.cert.org/vuls/id/605641/
third-party-advisoryx_refsource_CERT-VN
https://usn.ubuntu.com/4099-1/
vendor-advisoryx_refsource_UBUNTU
https://lists.fedoraproject.org/archives/list/package-ann...
vendor-advisoryx_refsource_FEDORA

EPSS Score

81% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

CVSS V3.0

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Thanks to Jonathan Looney of Netflix for reporting this vulnerability.
.