Is CVE-2020-14993 in the CISA KEV catalog?

No. CVE-2020-14993 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-14993?

CVE-2020-14993 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2020-14993?

CVE-2020-14993 has an EPSS score of 5.33% (92th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-14993?

Upgrade vigor2960 firmware to 1.5.1.1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2020-14993

CRITICALEPSS 92th pctl

9.8

CVSS v3

NVD

Description

A stack-based buffer overflow on DrayTek Vigor2960, Vigor3900, and Vigor300B devices before 1.5.1.1 allows remote attackers to execute arbitrary code via the formuserphonenumber parameter in an authusersms action to mainfunction.cgi.

CWE-787Out-of-bounds Write

How to fix

Remediation Available

vigor2960 firmwareNVD

Affected:< 1.5.1.1Fixed in:1.5.1.1CVE-2020-14993derived from NVD

vigor300b firmwareNVD

Affected:< 1.5.1.1Fixed in:1.5.1.1CVE-2020-14993derived from NVD

vigor3900 firmwareNVD

Affected:< 1.5.1.1Fixed in:1.5.1.1CVE-2020-14993derived from NVD

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 InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

5.33%probability of exploitation in 30 days

92ndpercentile

High risk: more likely to be exploited than 92% of all known CVEs.

References

Exploit1

github.com

Vendor Advisory1

draytek.com

Other references1

draytek.com

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.