HOMEVULNERABILITIESCVE-2018-20615
HIGH

CVE-2018-20615

CWE-125Published: March 21, 2019· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

An out-of-bounds read issue was discovered in the HTTP/2 protocol decoder in HAProxy 1.8.x and 1.9.x through 1.9.0 which can result in a crash. The processing of the PRIORITY flag in a HEADERS frame requires 5 extra bytes, and while these bytes are skipped, the total frame length was not re-checked to make sure they were present in the frame.

NVD Source

Technical Analysis

CVE-2018-20615 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

Canonical1 product(s)
ubuntu linux
haproxy1 product(s)
haproxy
openSUSE1 product(s)
leap
Red Hat2 product(s)
openshift container platformenterprise linux
Source: NVD CPE · 11 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2019-02/msg00018.html
ADVISORYhttp://www.securityfocus.com/bid/106645
ADVISORYhttps://access.redhat.com/errata/RHBA-2019:0327
ADVISORYhttps://access.redhat.com/errata/RHSA-2019:0275
ADVISORYhttps://usn.ubuntu.com/3858-1/
ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2019-02/msg00018.html
ADVISORYhttp://www.securityfocus.com/bid/106645
ADVISORYhttps://access.redhat.com/errata/RHBA-2019:0327
ADVISORYhttps://access.redhat.com/errata/RHSA-2019:0275
ADVISORYhttps://usn.ubuntu.com/3858-1/

All References (12)

→
http://lists.opensuse.org/opensuse-security-announce/2019-02/msg00018.htmlMailing List · Third Party Advisory
→
http://www.securityfocus.com/bid/106645Third Party Advisory · VDB Entry
→
https://access.redhat.com/errata/RHBA-2019:0327Third Party Advisory
→
https://access.redhat.com/errata/RHSA-2019:0275Third Party Advisory
→
https://usn.ubuntu.com/3858-1/Third Party Advisory
→
https://www.mail-archive.com/haproxy%40formilux.org/msg32304.html
→
http://lists.opensuse.org/opensuse-security-announce/2019-02/msg00018.htmlMailing List · Third Party Advisory
→
http://www.securityfocus.com/bid/106645Third Party Advisory · VDB Entry
→
https://access.redhat.com/errata/RHBA-2019:0327Third Party Advisory
→
https://access.redhat.com/errata/RHSA-2019:0275Third Party Advisory
→
https://usn.ubuntu.com/3858-1/Third Party Advisory
→
https://www.mail-archive.com/haproxy%40formilux.org/msg32304.html

Quick Facts

CVE IDCVE-2018-20615
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-125
CISA KEVNo
Affected4 vendor(s)
PublishedMar 21, 2019

Related CVEs (CWE-125)

CVE-2013-0767
10.0
CVE-2021-41556
10.0
CVE-2009-2523
10.0
CVE-2017-14451
10.0
CVE-2021-21777
10.0
CVE-2026-24826
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2018-20615 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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