CVE-2018-19115

keepalived before 2.0.7 has a heap-based buffer overflow when parsing HTTP status codes resulting in DoS or possibly unspecified other impact, because extract_status_code in lib/html.c has no validation of the status code and instead writes an unlimited amount of data to the heap.

Published: 2018-11-08 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-19115 is rated High Risk (68.3/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 3.67%). High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2018-19115

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 5.41% 3.67% -1.74%
2 2026-05-25 5.68% 5.41% -0.27%
3 2026-04-20 — 5.68% —

Full EPSS history (23 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-19115

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.0 CRITICAL
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2018-19115

OS Trackers for CVE-2018-19115

vendor priority summary link
debian low CVE-2018-19115 low priority: Debian including 1 source packages (keepalived), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2018-19115
gentoo normal CVE-2018-19115: 1 GLSA(s) (201903-01), 1 atom(s) (sys-cluster/keepalived); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2018-19115
redhat high — https://access.redhat.com/security/cve/CVE-2018-19115
suse high CVE-2018-19115 severity important: SUSE including 1 source package names (keepalived-1.3.5-8.el7_6), 1 product×package rows across 1 product lines (SUSE Liberty Linux 7): Fixed 1. https://www.suse.com/security/cve/CVE-2018-19115/
ubuntu medium CVE-2018-19115 medium priority: Ubuntu including 1 source packages (keepalived), 6 status rows across 6 suites (bionic, cosmic, disco, trusty, upstream, xenial): released 5, not-affected 1. https://ubuntu.com/security/CVE-2018-19115

Affected software / configurations for CVE-2018-19115

Vendor Product Version Raw CPE
keepalived keepalived < 2.0.7 cpe:2.3:a:keepalived:keepalived:*:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
redhat enterprise_linux_server 7.0 cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*
redhat enterprise_linux_server_aus 7.6 cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:*
redhat enterprise_linux_server_eus 7.6 cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:*:*:*:*:*:*:*
redhat enterprise_linux_server_tus 7.6 cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:*
redhat enterprise_linux_workstation 7.0 cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*

References for CVE-2018-19115

cvelogic Threat Intelligence