Is CVE-2019-18420 in the CISA KEV catalog?

No. CVE-2019-18420 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2019-18420?

CVE-2019-18420 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2019-18420?

CVE-2019-18420 has an EPSS score of 2.52% (83th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2019-18420?

Upgrade xen on debian 11 to 4.11.3+24-g14b62ab3e5-1 or later.

CVE & CISA-KEV Catalog

CVE-2019-18420

MEDIUMEPSS 83th pctl

6.5

CVSS v3

NVD

Description

An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to cause a denial of service via a VCPUOP_initialise hypercall. hypercall_create_continuation() is a variadic function which uses a printf-like format string to interpret its parameters. Error handling for a bad format character was done using BUG(), which crashes Xen. One path, via the VCPUOP_initialise hypercall, has a bad format character. The BUG() can be hit if VCPUOP_initialise executes for a sufficiently long period of time for a continuation to be created. Malicious guests may cause a hypervisor crash, resulting in a Denial of Service (DoS). Xen versions 4.6 and newer are vulnerable. Xen versions 4.5 and earlier are not vulnerable. Only x86 PV guests can exploit the vulnerability. HVM and PVH guests, and guests on ARM systems, cannot exploit the vulnerability.

CWE-134

How to fix

Remediation Available

xenDebian

Fixed in:4.11.3+24-g14b62ab3e5-1CVE-2019-18420

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 RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

2.52%probability of exploitation in 30 days

83rdpercentile

Elevated risk: more likely to be exploited than 83% of all known CVEs.

References

Patch2

Third-Party Advisory4

Other references3

Related Vulnerabilities

Other CWE-134 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-13160	Critical	9.8	81%	-	Fix
CVE-2023-22374	High	8.5	73%	-	-
CVE-2012-1851	High	10.0	66%	-	-
CVE-2024-23113	Critical	9.8	62%	KEV	-
CVE-2012-3569	High	9.3	48%	-	-
CVE-2018-6317	Critical	9.1	44%	-	-

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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 2024-11-21.