CVE-2018-20615: canonical ubuntu_linux Out-of-bounds Read
Vulnerability summary
CVE-2018-20615 is a high (CVSS 7.5) Out-of-bounds Read vulnerability in canonical ubuntu_linux. EPSS estimates a 4.46% chance of exploitation in the next 30 days, higher than 91.4% of scored vulnerabilities.
Severe, CVSS 7.5 (NVD); no exploitation reported by the 5 checked sources; EPSS 4% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 4 · Related 2Timeline
- 18-03-2019PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · Red hatEcosystem advisory · calculated5.9MediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:HDiffers
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
4.46%
Chance of exploitation in the next 30 days
Percentile
91%
Versus all other CVEs
30-day change
No change 0.00 pp
From 4.46% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Redhat8 products
- enterprise_linuxEOL7.0 | 7.4 | 7.5 | 7.6
- openshift_container_platform3.11
- haproxy< 0:1.8.17-3.el7
- haproxy-debuginfo< 0:1.8.17-3.el7
- haproxy18< 0:1.8.17-3.el7
Canonical1 product
- ubuntu_linuxEOL16.04 | 18.04 | 18.10
Debian1 product
- haproxy< 1.8.16-2
Haproxy1 product
- haproxyEOL≥ 1.8.0, ≤ 1.8.19 | 1.9.0 | 1.9.0:dev0 | 1.9.0:dev1 | 1.9.0:dev10 | 1.9.0:dev11 | 1.9.0:dev2 | 1.9.0:dev3 | 1.9.0:dev4 | 1.9.0:dev5 | 1.9.0:dev6 | 1.9.0:dev7 | 1.9.0:dev8 | 1.9.0:dev9
Opensuse1 product
- leapEOL15.0
Suse1 product
- haproxy&distro=SUSE Linux Enterprise High Availability Extension 15< 1.8.17~git0.e89d25b2-3.9.1
Ubuntu1 product
- haproxy< 1.8.8-1ubuntu0.3
7 vendors · 14 products
References
21 links- access.redhat.com/errata/RHSA-2019:0275Vendor AdvisoryX Refsource REDHATThird Party AdvisoryAdvisory
- lists.opensuse.org/opensuse-security-announce/2019-02/msg00018.htmlMailing ListX Refsource MLISTThird Party Advisory
