CVE-2018-20615: n/a vulnerability

CVE-2018-20615: An out-of-bounds read issue was discovered in the HTTP/2 protocol decoder in HAProxy 1.8.x and 1.9.x throug...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 5, 2024, 12:05 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2018-20615 is a denial-of-service risk in HAProxy’s HTTP/2 handling. A malformed HTTP/2 HEADERS frame can trigger an out-of-bounds read and crash affected HAProxy versions, interrupting traffic routed through the proxy. Exposure is most likely on internet-facing or internal HAProxy deployments with HTTP/2 enabled and running HAProxy 1.8.x or 1.9.x through 1.9.0. Treat this as a service availability issue. Patch exposed HAProxy systems promptly, especially where downtime would affect customer-facing applications or shared infrastructure. Mitigation focus: Identify HAProxy instances with HTTP/2 enabled.; Upgrade HAProxy using vendor-supported fixed packages or releases.; Prioritize internet-facing reverse proxies and load balancers..

Prepared: Jun 6, 2026, 21:28 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Mar 18, 2019, 16:11 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

5Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
RHSA-2019:0275CVE reference · vendor-advisory, x_refsource_REDHAT
3858-1CVE reference · vendor-advisory, x_refsource_UBUNTU
[haproxy@formilux.org] 20190108 [ANNOUNCE] haproxy-1.8.17CVE reference · mailing-list, x_refsource_MLIST
RHBA-2019:0327CVE reference · vendor-advisory, x_refsource_REDHAT

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

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