Is CVE-2020-9498 in the CISA KEV catalog?

No. CVE-2020-9498 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-9498?

CVE-2020-9498 has a CVSS v3 base score of 6.7 (MEDIUM).

What is the EPSS score for CVE-2020-9498?

CVE-2020-9498 has an EPSS score of 0.74% (50th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-9498?

Upgrade guacamole-server on debian 11 to 1.3.0-1 or later.

CVE & CISA-KEV Catalog

CVE-2020-9498

MEDIUM

6.7

CVSS v3

NVD

Description

Apache Guacamole 1.1.0 and older may mishandle pointers involved inprocessing data received via RDP static virtual channels. If a userconnects to a malicious or compromised RDP server, a series ofspecially-crafted PDUs could result in memory corruption, possiblyallowing arbitrary code to be executed with the privileges of therunning guacd process.

CWE-787Out-of-bounds Write

How to fix

Remediation Available

guacamole-serverDebian

Fixed in:1.3.0-1CVE-2020-9498

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 VectorLocal

Attack ComplexityHigh

Privileges RequiredLow

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.74%probability of exploitation in 30 days

50thpercentile

Moderate risk: more likely to be exploited than 50% of all known CVEs.

References

Third-Party Advisory4

Other references5

Related Vulnerabilities

Other CWE-787 (Out-of-bounds Write) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2023-4863	High	8.8	100%	KEV	Fix
CVE-2020-16040	Medium	6.5	100%	-	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 2024-11-21.