CVE-2021-1609

Q: How do I fix CVE-2021-1609?

Upgrade small business rv series router firmware to 1.0.03.22 or later.

Q: Is CVE-2021-1609 being actively exploited?

Not that we know of. CVE-2021-1609 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 9.7% is the estimated probability that it will be exploited in the next 30 days. That is higher than 95% of all scored CVEs.

Q: How severe is CVE-2021-1609?

CVE-2021-1609 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2021-1609 affect?

Published advisories record a fix for small business rv series router firmware (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

CRITICALEPSS 95th pctl

9.8

CVSS v3

NVD

Description

Multiple vulnerabilities in the web-based management interface of the Cisco Small Business RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers could allow an attacker to do the following: Execute arbitrary code Cause a denial of service (DoS) condition Execute arbitrary commands For more information about these vulnerabilities, see the Details section of this advisory.

CWE-121Stack-based Buffer Overflow

How to fix

Remediation Available

small business rv series router firmwareNVD

Affected:< 1.0.03.22Fixed in:1.0.03.22CVE-2021-1609derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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

9.69%probability of exploitation in 30 days

95thpercentile

Very high risk: more likely to be exploited than 95% of all known CVEs.

References

Vendor Advisory1

tools.cisco.com

Related Vulnerabilities

Other CWE-121 (Stack-based Buffer Overflow) 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-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2009-0927	High	8.8	97%	KEV	Fix
CVE-2020-10924	High	8.8	87%	-	-
CVE-2022-20705	Critical	10.0	80%	-	-

Common questions

How do I fix CVE-2021-1609?

Upgrade small business rv series router firmware to 1.0.03.22 or later.

Is CVE-2021-1609 being actively exploited?

Not that we know of. CVE-2021-1609 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 9.7% is the estimated probability that it will be exploited in the next 30 days. That is higher than 95% of all scored CVEs.

How severe is CVE-2021-1609?

CVE-2021-1609 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2021-1609 affect?

Published advisories record a fix for small business rv series router firmware (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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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.