CVE-2020-15803

Zabbix before 3.0.32rc1, 4.x before 4.0.22rc1, 4.1.x through 4.4.x before 4.4.10rc1, and 5.x before 5.0.2rc1 allows stored XSS in the URL Widget.

Published: 2020-07-17 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-15803 is rated Moderate Risk (58.6/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 5.07%). EPSS rose +2.76% over the last day, indicating growing attacker interest. Review affected assets and schedule 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-2020-15803

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 2026-04-14 2.31% 5.07% +2.76%
2 2026-04-13 2.09% 2.31% +0.21%
3 2025-11-21 — 2.09% —

Full EPSS history (23 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-15803

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.1 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N 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:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 2.7 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2020-15803

OS Trackers for CVE-2020-15803

vendor priority summary link
debian not yet assigned CVE-2020-15803 not yet assigned priority: Debian including 1 source packages (zabbix), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2020-15803
suse medium CVE-2020-15803 severity moderate: SUSE including 69 source package names (zabbix-agent-3.0.31-bp151.4.6.1, zabbix-agent-3.0.31-bp152.2.3.1, …), 81 product×package rows across 10 product lines (SUSE Linux Enterprise Server 12 SP3-TERADATA, SUSE Linux Enterprise Server 12 SP5, … (10 product lines)): Fixed 81. https://www.suse.com/security/cve/CVE-2020-15803/
ubuntu medium CVE-2020-15803 medium priority: Ubuntu including 1 source packages (zabbix), 15 status rows across 15 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, trusty, upstream, xenial): not-affected 10, released 3, DNE 1, needs-triage 1. https://ubuntu.com/security/CVE-2020-15803

Affected software / configurations for CVE-2020-15803

Vendor Product Version Raw CPE
zabbix zabbix <= 3.0.31 cpe:2.3:a:zabbix:zabbix:*:*:*:*:*:*:*:*
zabbix zabbix >= 4.0.0, <= 4.0.21 cpe:2.3:a:zabbix:zabbix:*:*:*:*:*:*:*:*
zabbix zabbix >= 4.4, <= 4.4.9 cpe:2.3:a:zabbix:zabbix:*:*:*:*:*:*:*:*
zabbix zabbix >= 5.0.0, <= 5.0.1 cpe:2.3:a:zabbix:zabbix:*:*:*:*:*:*:*:*
zabbix zabbix 3.0.32 cpe:2.3:a:zabbix:zabbix:3.0.32:rc1:*:*:*:*:*:*
zabbix zabbix 4.0.22 cpe:2.3:a:zabbix:zabbix:4.0.22:-:*:*:*:*:*:*
zabbix zabbix 4.0.22 cpe:2.3:a:zabbix:zabbix:4.0.22:rc1:*:*:*:*:*:*
zabbix zabbix 4.4.10 cpe:2.3:a:zabbix:zabbix:4.4.10:-:*:*:*:*:*:*
zabbix zabbix 4.4.10 cpe:2.3:a:zabbix:zabbix:4.4.10:rc1:*:*:*:*:*:*
zabbix zabbix 5.0.2 cpe:2.3:a:zabbix:zabbix:5.0.2:-:*:*:*:*:*:*
zabbix zabbix 5.0.2 cpe:2.3:a:zabbix:zabbix:5.0.2:rc1:*:*:*:*:*:*
fedoraproject fedora 31 cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
fedoraproject fedora 32 cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
opensuse backports sle-15 cpe:2.3:o:opensuse:backports:sle-15:sp1:*:*:*:*:*:*
opensuse backports sle-15 cpe:2.3:o:opensuse:backports:sle-15:sp2:*:*:*:*:*:*
opensuse leap 15.1 cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
opensuse leap 15.2 cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*

References for CVE-2020-15803

cvelogic Threat Intelligence