Cyber Resilience

CVE-2022-20699

Memory Safety in Cisco Rv340 Firmware ≤ 1.0.03.24

CISA KEVActive ExploitationEUVD ExploitedPublic PoCMemory Safety
Published
10 February 2022
Modified
28 October 2025
KEV Added
03 March 2022
Patch / advisory
View advisory
CVSS Score v3.1 10.0
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS Score 0.72 99.4th percentile
Risk Priority 100 floored blend · peak EPSS

Summary

CVE-2022-20699 is a critical-severity Stack-based Buffer Overflow (CWE-121) vulnerability in Cisco Rv340 Firmware. Its CVSS base score is 10.0 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked in the top 0.6% of CVEs by exploit likelihood; CISA has added it to the Known Exploited Vulnerabilities catalog; a public proof-of-concept is referenced.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

CVE-2022-20699 encompasses multiple vulnerabilities, including stack-based buffer overflows and improper input validation, affecting Cisco Small Business RV160, RV260, RV340, and RV345 Series Routers. These issues carry a CVSS score of 10.0 and are associated with CWE-121 and CWE-1284.

An unauthenticated remote attacker can exploit the flaws over the network to execute arbitrary code, elevate privileges, run unsigned software, bypass authentication controls, or trigger denial-of-service conditions, as demonstrated by public proof-of-concept material targeting the RV340 SSL VPN interface.

The Cisco Security Advisory and related disclosures from Zero Day Initiative indicate that patches or firmware updates address the issues, with the EPSS score reaching a peak of 0.9648 and remaining at 0.8940, reflecting sustained exploitation interest after public disclosure.

EU & UK References

Vulnerability Data

Multiple vulnerabilities in Cisco Small Business RV160, RV260, RV340, and RV345 Series Routers could allow an attacker to do any of the following: Execute arbitrary code Elevate privileges Execute arbitrary commands Bypass authentication and authorization protections Fetch and run unsigned…

more

software Cause denial of service (DoS) For more information about these vulnerabilities, see the Details section of this advisory.

CWE(s)
CWE-121CWE-1284
KEV Date Added
03 March 2022

Related Threats

MITRE ATT&CK Enterprise Techniques

T1068 Exploitation for Privilege Escalation Privilege Escalation
Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.
attack.mitre.org →
T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1203 Exploitation for Client Execution Execution
Adversaries may exploit software vulnerabilities in client applications to execute code.
attack.mitre.org →
T1210 Exploitation of Remote Services Lateral Movement
Adversaries may exploit remote services to gain unauthorized access to internal systems once inside of a network.
attack.mitre.org →
T1212 Exploitation for Credential Access Credential Access
Adversaries may exploit software vulnerabilities in an attempt to collect credentials.
attack.mitre.org →
T1499 Endpoint Denial of Service Impact
Adversaries may perform Endpoint Denial of Service (DoS) attacks to degrade or block the availability of services to users.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2022-20701Same product: Cisco Rv340both on KEV
CVE-2022-20708Same product: Cisco Rv340both on KEV
CVE-2022-20707Same product: Cisco Rv340
CVE-2022-20700Same product: Cisco Rv340both on KEV
CVE-2022-20703Same product: Cisco Rv340both on KEV
CVE-2023-20007Same product: Cisco Rv340
CVE-2021-1473Same product: Cisco Rv340
CVE-2025-20352Same vendor: Ciscoboth on KEV
CVE-2023-20073Same product: Cisco Rv340
CVE-2022-20705Same product: Cisco Rv340

Affected Assets

cisco
rv340 firmware
≤ 1.0.03.24
cisco
rv340w firmware
≤ 1.0.03.24
cisco
rv345 firmware
≤ 1.0.03.24
cisco
rv345p firmware
≤ 1.0.03.24

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)
  • 2 hardening rules · 2 OS baselines
Validate
Prove the fix (OWASP ASVS)
  • V6.7.2
  • V1.4.2
  • V2.1.1
  • V2.2.1

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure-development practices directly prevent introduction of stack buffer overflows.

ID.RA-01 partial match
prevents

Vulnerability scanning can discover stack buffer overflows but does not prevent their introduction.

PR.PS-02 partial match
prevents

Patching eliminates known instances of the weakness after discovery.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing (fuzzing, static analysis) detects stack overflows before release.

A.8.25 Secure development life cycle partial match
prevents

Secure SDLC mandates buffer-safety practices that directly prevent stack overflows.

A.8.26 Application security requirements partial match
prevents

Application security requirements can specify buffer-size and input-validation rules.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture principles include memory-safety and least-privilege stack usage.

A.8.28 Secure coding partial match
prevents

Secure coding standards explicitly forbid unsafe buffer handling that causes CWE-121.

A.8.32 Change management none match
none

Change-management gates can enforce security reviews that catch buffer issues.

Hardening callouts derived

Configuration rules from DISA STIG baselines that bear on weaknesses of the type cited by this CVE. Each rule is shown with the relationship its mapping actually records, against the CWE it was authored against. Derived via CVE→CWE over `controls_xwalks` (authoritative rows only; rows rated `none` are excluded).

Oracle Linux 8 (1 rule)
  • V-248594 OL 8 must implement address space layout randomization (ASLR) to protect its memory from unauthorized code execution. prevents CWE-121
Oracle Linux 9 (1 rule)
  • V-271452 OL 9 must use a Linux Security Module configured to enforce limits on system services. prevents CWE-121

References