Is CVE-2019-9517 being actively exploited?

It is not currently in CISA's KEV catalog. Its EPSS exploitation probability is 28%.

What products does CVE-2019-9517 affect?

Tracked products affected include JBoss. Check the version you run to see whether it is affected.

How do I fix CVE-2019-9517?

Apply the vendor fix promptly. Upgrade affected products to a fixed version.

CVE-2019-9517

Q: What is CVE-2019-9517?

CVE-2019-9517 is a high-severity software vulnerability (Uncontrolled resource consumption) with a CVSS score of 7.5. Some HTTP/2 implementations are vulnerable to unconstrained interal data buffering, potentially leading to a denial of service. The attacker opens the HTTP/2 window so the peer can send without constraint; however, they leave the TCP window

HIGH severity · CVSS 7.5 · Uncontrolled resource consumption

7.5CVSS HIGH

Summary

Some HTTP/2 implementations are vulnerable to unconstrained interal data buffering, potentially leading to a denial of service. The attacker opens the HTTP/2 window so the peer can send without constraint; however, they leave the TCP window closed so the peer cannot actually write (many of) the bytes on the wire. The attacker then sends a stream of requests for a large response object. Depending on how the servers queue the responses, this can consume excess memory, CPU, or both.

Impact & exploitability

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

Confidentiality impactNone

Integrity impactNone

Availability impactHigh

Exploit probability (EPSS)28%

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

Affected products we track (1)

JBoss

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

CVE-2019-9517

Summary

Impact & exploitability

Affected products we track (1)

Recommendation

Additional information