CVE-2019-16239

Name: CVE-2019-16239
Creator: NVD / NIST
Published: 2019-09-17T12:15:10.56+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 3.45%

Last modified Jun 17, 2026

CVE-2019-16239 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. process_http_response in OpenConnect before 8.05 has a Buffer Overflow when a malicious server uses HTTP chunked encoding with crafted chunk sizes.. EPSS estimates a 3.45% chance of exploitation in the next 30 days.

Description

process_http_response in OpenConnect before 8.05 has a Buffer Overflow when a malicious server uses HTTP chunked encoding with crafted chunk sizes.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

3.45%

87.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-120

Affected Software

Vendor	Product	Versions
Infradead	Openconnect	< 8.05
Fedoraproject	Fedora	29
Fedoraproject	Fedora	30
Fedoraproject	Fedora	31
Debian	Debian Linux	8.0
Debian	Debian Linux	9.0
Debian	Debian Linux	10.0
Canonical	Ubuntu Linux	18.04
Opensuse	Leap	15.0
Opensuse	Leap	15.1

References

http://lists.infradead.org/pipermail/openconnect-devel/2019-September/005412.htmlBroken Link
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00060.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00061.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/10/msg00003.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FX56KYWC7X4ETV4P6HGJC7GZUEBITBBS/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HDMZGNBLZZKAGBI2PNXYWWKLD2LXKFH6/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WI7ZENFAWCHF2RU4NHPL2CU4WGZ4BNDJ/
https://seclists.org/bugtraq/2020/Jan/31Mailing List, Third Party Advisory
https://t2.fi/schedule/2019/Not Applicable
https://usn.ubuntu.com/4565-1/Third Party Advisory
https://www.debian.org/security/2020/dsa-4607Third Party Advisory
http://lists.infradead.org/pipermail/openconnect-devel/2019-September/005412.htmlBroken Link
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00060.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00061.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/10/msg00003.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FX56KYWC7X4ETV4P6HGJC7GZUEBITBBS/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HDMZGNBLZZKAGBI2PNXYWWKLD2LXKFH6/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WI7ZENFAWCHF2RU4NHPL2CU4WGZ4BNDJ/
https://seclists.org/bugtraq/2020/Jan/31Mailing List, Third Party Advisory
https://t2.fi/schedule/2019/Not Applicable
https://usn.ubuntu.com/4565-1/Third Party Advisory
https://www.debian.org/security/2020/dsa-4607Third Party Advisory

Timeline

Published: Sep 17, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-16239?

process_http_response in OpenConnect before 8.05 has a Buffer Overflow when a malicious server uses HTTP chunked encoding with crafted chunk sizes.

How severe is CVE-2019-16239?

CVE-2019-16239 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.45% probability of exploitation in the next 30 days.

How do I fix CVE-2019-16239?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-16239?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST