Is CVE-2017-9781 in the CISA KEV catalog?

No. CVE-2017-9781 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-9781?

CVE-2017-9781 has a CVSS v3 base score of 6.1 (MEDIUM).

What is the EPSS score for CVE-2017-9781?

CVE-2017-9781 has an EPSS score of 1.56% (72th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-9781?

Upgrade check-mk on ubuntu 16.04 to 1.2.6p12-1ubuntu0.16.04.1+esm1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2017-9781

MEDIUMEPSS 72th pctl

6.1

CVSS v3

NVD

Description

A cross site scripting (XSS) vulnerability exists in Check_MK versions 1.4.0x prior to 1.4.0p6, allowing an unauthenticated remote attacker to inject arbitrary HTML or JavaScript via the _username parameter when attempting authentication to webapi.py, which is returned unencoded with content type text/html.

CWE-79Cross-Site Scripting (XSS)

How to fix

Remediation Available

check-mkUbuntu

Fixed in:1.2.6p12-1ubuntu0.16.04.1+esm1USN-5527-2

Fixed in:1.2.8p16-1ubuntu0.2USN-5527-1

check-mk-livestatusUbuntu

Fixed in:1.2.6p12-1ubuntu0.16.04.1+esm1USN-5527-2

Fixed in:1.2.8p16-1ubuntu0.2USN-5527-1

check-mk-multisiteUbuntu

Fixed in:1.2.6p12-1ubuntu0.16.04.1+esm1USN-5527-2

Fixed in:1.2.8p16-1ubuntu0.2USN-5527-1

check-mk-serverUbuntu

Fixed in:1.2.6p12-1ubuntu0.16.04.1+esm1USN-5527-2

Fixed in:1.2.8p16-1ubuntu0.2USN-5527-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Exploit Intelligence

1.56%probability of exploitation in 30 days

72ndpercentile

Elevated risk: more likely to be exploited than 72% of all known CVEs.

References

Exploit1

tenable.com

Other references1

git.mathias-kettner.de

Related Vulnerabilities

Other CWE-79 (Cross-Site Scripting (XSS)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-11022	Medium	6.9	99%	-	Fix
CVE-2019-3929	Critical	9.8	99%	KEV	Fix
CVE-2020-9496	Medium	6.1	99%	-	-
CVE-2023-28341	Medium	6.1	99%	-	Fix
CVE-2018-12998	Medium	6.1	98%	-	-
CVE-2025-4123	High	7.6	98%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-13.