CVE-2019-16239
process_http_response in OpenConnect before 8.05 has a Buffer Overflow when a malicious server...
process_http_response in OpenConnect before 8.05 has a Buffer Overflow when a malicious server uses HTTP chunked encoding with crafted chunk sizes.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
process_http_response in OpenConnect before 8.05 has a Buffer Overflow when a malicious server uses HTTP chunked encoding with crafted chunk sizes.
- Record
CVE-2019-16239- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-120
- Updated
- 2026-11-02
CVE List No score
process_http_response in OpenConnect before 8.05 has a Buffer Overflow when a malicious server uses HTTP chunked encoding with crafted chunk sizes.
- Record
CVE-2019-16239- Updated
- 2026-11-02
EUVDEUVD-2019-7046 No score
process_http_response in OpenConnect before 8.05 has a Buffer Overflow when a malicious server uses HTTP chunked encoding with crafted chunk sizes.
- Record
EUVD-2019-7046- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-j5c8-5345-567f
process_http_response in OpenConnect before 8.05 has a Buffer Overflow when a malicious server...
process_http_response in OpenConnect before 8.05 has a Buffer Overflow when a malicious server uses HTTP chunked encoding with crafted chunk sizes.
- Record
GHSA-j5c8-5345-567f- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-120
- Updated
- 2026-11-02
OSV
process_http_response in OpenConnect before 8.05 has a Buffer Overflow when a malicious server uses HTTP chunked encoding with crafted chunk sizes.
- Record
CVE-2019-16239- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVDEBIAN-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.
- Record
DEBIAN-CVE-2019-16239- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
Show 9 moreShow less
OSVUBUNTU-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.
- Record
UBUNTU-CVE-2019-16239- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVMGASA-2020-0005 No score
Updated openconnect packages fix security vulnerability
Updated openconnect packages fix security vulnerability:
Buffer overflow when a malicious server uses HTTP chunked encoding with crafted chunk sizes (CVE-2019-16239).
- Record
MGASA-2020-0005- Updated
- 2026-11-02
OSVopenSUSE-SU-2019:2385-1 No score
Security update for openconnect
This update for openconnect fixes the following issues:
- CVE-2019-16239: Fixed a buffer overflow when a malicious server uses HTTP chunked encoding with crafted chunk sizes. (bsc#1151178)
This update was imported from the SUSE:SLE-15:Update update project.
- Record
openSUSE-SU-2019:2385-1- Updated
- 2026-11-02
OSVopenSUSE-SU-2019:2388-1 No score
Security update for openconnect
This update for openconnect fixes the following issues:
- CVE-2019-16239: Fixed a buffer overflow when a malicious server uses HTTP chunked encoding with crafted chunk sizes. (bsc#1151178)
This update was imported from the SUSE:SLE-15:Update update project.
- Record
openSUSE-SU-2019:2388-1- Updated
- 2026-11-02
OSVopenSUSE-SU-2024:13322-1 No score
libopenconnect5-9.12-2.1 on GA media
These are all security issues fixed in the libopenconnect5-9.12-2.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2024:13322-1- Updated
- 2026-11-02
OSVSUSE-SU-2019:2737-1 No score
Security update for openconnect
This update for openconnect fixes the following issues:
- CVE-2019-16239: Fixed a buffer overflow when a malicious server uses HTTP chunked encoding with crafted chunk sizes. (bsc#1151178)
- Record
SUSE-SU-2019:2737-1- Updated
- 2026-11-02
OSVSUSE-SU-2019:2744-1 No score
Security update for openconnect
This update for openconnect fixes the following issues:
- CVE-2019-16239: Fixed a buffer overflow when a malicious server uses HTTP chunked encoding with crafted chunk sizes. (bsc#1151178)
- Record
SUSE-SU-2019:2744-1- Updated
- 2026-11-02
OSVSUSE-SU-2019:2744-2 No score
Security update for openconnect
This update for openconnect fixes the following issues:
- CVE-2019-16239: Fixed a buffer overflow when a malicious server uses HTTP chunked encoding with crafted chunk sizes. (bsc#1151178)
- Record
SUSE-SU-2019:2744-2- Updated
- 2026-11-02
OSVUSN-4565-1 No score
openconnect vulnerability
It was discovered that OpenConnect has a buffer overflow when a malicious server uses HTTP chunked encoding with crafted chunk sizes. An attacker could use it to provoke a denial of service (crash).
- Record
USN-4565-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
openconnectDebian:12 |
before 8.02-1.1 | 8.02-1.1 |
openconnectDebian:13 |
before 8.02-1.1 | 8.02-1.1 |
openconnectDebian:14 |
before 8.02-1.1 | 8.02-1.1 |
openconnectDebian:8 |
before 6.00-2+deb8u1, plus listed versions 6.00-2 |
6.00-2+deb8u1 |
openconnectDebian:9 |
before 7.08-1+deb9u1, plus listed versions 7.08-1 |
7.08-1+deb9u1 |
openconnectDebian:10 |
before 8.02-1+deb10u1, plus listed versions 8.02-1 |
8.02-1+deb10u1 |
openconnectMageia:7 |
before 8.05-1.mga7 | 8.05-1.mga7 |
openconnectSUSE:Linux Enterprise Workstation Extension 15 |
before 7.08-6.3.1 | 7.08-6.3.1 |
openconnectSUSE:Linux Enterprise Workstation Extension 15 SP1 |
before 7.08-6.3.1 | 7.08-6.3.1 |
openconnectSUSE:Linux Enterprise Desktop 12 SP4 |
before 7.08-3.4.1 | 7.08-3.4.1 |
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| Package | Affected | Fixed |
|---|---|---|
openconnectSUSE:Linux Enterprise Workstation Extension 12 SP4 |
before 7.08-3.4.1 | 7.08-3.4.1 |
openconnectSUSE:Linux Enterprise Workstation Extension 12 SP5 |
before 7.08-3.4.1 | 7.08-3.4.1 |
openconnectUbuntu:18.04:LTS |
before 7.08-3ubuntu0.18.04.2, plus listed versions 7.08-17.08-27.08-37.08-3ubuntu0.18.04.1 |
7.08-3ubuntu0.18.04.2 |
openconnectopenSUSE:Leap 15.1 |
before 7.08-lp151.6.3.1 | 7.08-lp151.6.3.1 |
openconnectopenSUSE:Leap 15.0 |
before 7.08-lp150.5.3.1 | 7.08-lp150.5.3.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2019-16239 is a critical vulnerability (CVSS 9.8) in Infradead Openconnect, published September 17, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.45%, the 89th percentile. Fixed in openconnect 8.02-1.1.
References
t2.fi/schedule/2019
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WI7ZENFAWCHF2RU4NHPL2CU4WGZ4BNDJ
lists.infradead.org/pipermail/openconnect-devel/2019-September/005412.html
lists.debian.org/debian-lts-announce/2019/10/msg00003.html
Show 25 moreShow less
lists.opensuse.org/opensuse-security-announce/2019-10/msg00060.html
debian.org/security/2020/dsa-4607
seclists.org/bugtraq/2020/Jan/31
usn.ubuntu.com/4565-1
nvd.nist.gov/vuln/detail/CVE-2019-16239
github.com/advisories/GHSA-j5c8-5345-567f
security-tracker.debian.org/tracker/CVE-2019-16239
advisories.mageia.org/MGASA-2020-0005.html
bugs.mageia.org/show_bug.cgi?id=25803
suse.com/support/update/announcement/2019/suse-su-20192737-1
bugzilla.suse.com/1151178
ubuntu.com/security/CVE-2019-16239
cve.org/CVERecord?id=CVE-2019-16239