CVE-2018-14645 — A flaw was discovered in the HPACK decoder of HAProxy, before 1

A flaw was discovered in the HPACK decoder of HAProxy, before 1.8.14, that is used for HTTP/2. An out-of-bounds read access in hpack_valid_idx() resulted in a remote crash and denial of service.

01What is this vulnerability?

A flaw was discovered in the HPACK decoder of HAProxy, before 1.8.14, that is used for HTTP/2. An out-of-bounds read access in hpack_valid_idx() resulted in a remote crash and denial of service.

02Affected products

Vendor	Product	Versions
[UNKNOWN]	haproxy	1.8.14

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2018-09-21T13:00:00.000Z
• Last modified: 2024-08-05T09:38:12.812Z

09References

• usn.ubuntu.com — https://usn.ubuntu.com/3780-1/
• access.redhat.com — https://access.redhat.com/errata/RHSA-2018:2882
• www.mail-archive.com — https://www.mail-archive.com/haproxy%40formilux.org/msg31253.html
• bugzilla.redhat.com — https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14645
• access.redhat.com — https://access.redhat.com/errata/RHBA-2019:0028