CVE-2020-3422
CVE-2020-3422 is a high-severity vulnerability in Cisco Ios Xe with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-371.
Key facts
- Severity: High (CVSS 3.x base score 7.5)
- CVSS v2: 4.3
- EPSS exploit prediction: 1% (66th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-371
- Affected product: Cisco Ios Xe
- Published:
- Last modified:
Description
A vulnerability in the IP Service Level Agreement (SLA) responder feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause the IP SLA responder to reuse an existing port, resulting in a denial of service (DoS) condition. The vulnerability exists because the IP SLA responder could consume a port that could be used by another feature. An attacker could exploit this vulnerability by sending specific IP SLA control packets to the IP SLA responder on an affected device. The control packets must include the port number that could be used by another configured feature. A successful exploit could allow the attacker to cause an in-use port to be consumed by the IP SLA responder, impacting the feature that was using the port and resulting in a DoS condition.
Frequently asked questions
- What is CVE-2020-3422?
- A vulnerability in the IP Service Level Agreement (SLA) responder feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause the IP SLA responder to reuse an existing port, resulting in a denial of service (DoS) condition. The vulnerability exists because the IP SLA responder could consume a port that could be used by another feature. An attacker could exploit this vulnerability by sending specific IP SLA control packets to the IP SLA responder on an affected device. The control packets must include the port number that could be used by another configured feature. A successful exploit could allow the attacker to cause an in-use port to be consumed by the IP SLA responder, impacting the feature that was using the port and resulting in a DoS condition.
- How severe is CVE-2020-3422?
- CVE-2020-3422 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2020-3422 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2020-3422?
- CVE-2020-3422 affects Cisco Ios Xe. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2020-3422?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2020-3422 published?
- CVE-2020-3422 was published on 2020-09-24 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:o:cisco:ios_xe:16.9.3:*:*:*:*:*:*:*
More vulnerabilities in Cisco Ios Xe
- CVE-2025-20188 — Critical (CVSS 10.0): A vulnerability in the Out-of-Band Access Point (AP) Image Download, the Clean Air Spectral Recording, and the client…
- CVE-2023-20198 — Critical (CVSS 10.0): Cisco is providing an update for the ongoing investigation into observed exploitation of the web UI feature in Cisco…
- CVE-2021-34770 — Critical (CVSS 10.0): A vulnerability in the Control and Provisioning of Wireless Access Points (CAPWAP) protocol processing of Cisco IOS XE…
- CVE-2019-12643 — Critical (CVSS 10.0): A vulnerability in the Cisco REST API virtual service container for Cisco IOS XE Software could allow an…
- CVE-2021-1619 — Critical (CVSS 9.8): A vulnerability in the authentication, authorization, and accounting (AAA) function of Cisco IOS XE Software could…
- CVE-2020-3227 — Critical (CVSS 9.8): A vulnerability in the authorization controls for the Cisco IOx application hosting infrastructure in Cisco IOS XE…
All CVEs affecting Cisco Ios Xe →
Other CWE-371 vulnerabilities
- CVE-2024-20455 — High (CVSS 8.6): A vulnerability in the process that classifies traffic that is going to the Unified Threat Defense (UTD) component of…
- CVE-2020-3574 — High (CVSS 7.5): A vulnerability in the TCP packet processing functionality of Cisco IP Phones could allow an unauthenticated, remote…
- CVE-2019-1977 — Medium (CVSS 6.8): A vulnerability within the Endpoint Learning feature of Cisco Nexus 9000 Series Switches running in Application Centric…
- CVE-2018-0282 — Medium (CVSS 6.8): A vulnerability in the TCP socket code of Cisco IOS and IOS XE Software could allow an unauthenticated, remote attacker…
- CVE-2020-3385 — Medium (CVSS 6.5): A vulnerability in the deep packet inspection (DPI) engine of Cisco SD-WAN vEdge Routers could allow an…
- CVE-2026-14685 — Low (CVSS 3.3): A vulnerability has been found in HdrHistogram up to 2.2.2. This vulnerability affects the function…