# CVE-2021-1379: Memory corruption in Cisco IP Phones with Multiplatform Firmware > Unauthenticated adjacent attackers can execute code or cause denial of service on Cisco IP Phones via malicious CDP or LLDP packets. - **Severity:** Medium 6.5 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/RL:X/RC:X/E:X`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Local or same network only - **Victim action needed:** Not needed - **Fix available:** No - **Published:** 18 Nov 2024 - **Updated:** 18 Nov 2024 - **Also known as:** GHSA-722m-4rr5-cvfh ## What is CVE-2021-1379? CVE-2021-1379 is a medium-severity memory corruption vulnerability in Cisco IP Phones with Multiplatform Firmware, published on 18 Nov 2024. It can only be exploited from the same machine or local network, with no action from the victim. ### Official description Multiple vulnerabilities in the Cisco Discovery Protocol and Link Layer Discovery Protocol (LLDP) implementations for Cisco IP Phone Series 68xx/78xx/88xx could allow an unauthenticated, adjacent attacker to execute code remotely or cause a reload of an affected IP phone. These vulnerabilities are due to missing checks when the IP phone processes a Cisco Discovery Protocol or LLDP packet. An attacker could exploit these vulnerabilities by sending a malicious Cisco Discovery Protocol or LLDP packet to the targeted IP phone. A successful exploit could allow the attacker to execute code on the affected IP phone or cause it to reload unexpectedly, resulting in a denial of service (DoS) condition.Note: Cisco Discovery Protocol is a Layer 2 protocol. To exploit these vulnerabilities, an attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent).Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities. Weakness: CWE-120 (Buffer Copy without Checking Size of Input) ## Which versions are affected by CVE-2021-1379? It affects 34 products. Products: Cisco Ip Conference Phone 7832 Firmware, Cisco Ip Conference Phone 7832 With Multiplatform Firmware, Cisco Ip Conference Phone 8832 Firmware, Cisco Ip Conference Phone 8832 With Multiplatform Firmware, Cisco Ip Phone 6821 With Multiplatform Firmware, Cisco Ip Phone 6841 With Multiplatform Firmware, Cisco Ip Phone 6851 With Multiplatform Firmware, Cisco Ip Phone 6861 With Multiplatform Firmware, Cisco Ip Phone 6871 With Multiplatform Firmware, Cisco Ip Phone 7811 Firmware, Cisco Ip Phone 7811 With Multiplatform Firmware, Cisco Ip Phone 7821 Firmware, Cisco Ip Phone 7821 With Multiplatform Firmware, Cisco Ip Phone 7841 Firmware, Cisco Ip Phone 7841 With Multiplatform Firmware, Cisco Ip Phone 7861 Firmware, Cisco Ip Phone 7861 With Multiplatform Firmware, Cisco Ip Phone 8811 Firmware, Cisco Ip Phone 8811 With Multiplatform Firmware, Cisco Ip Phone 8841 Firmware and 14 more. ## How do I fix CVE-2021-1379? No fix has been published for CVE-2021-1379 yet. Limit exposure of the affected software until one is available. ## Is CVE-2021-1379 being exploited? There is no known exploitation of CVE-2021-1379 in the wild and no public exploit code. ## Other vulnerabilities in Cisco IP Phones with Multiplatform Firmware - [CVE-2020-3111](https://insights.sbomify.com/CVE-2020-3111/): Cisco IP Phone Remote Code Execution and Denial of Service Vulnerability (high 8.8) - [CVE-2019-1635](https://insights.sbomify.com/CVE-2019-1635/): Cisco IP Phone 7800 Series and 8800 Series Session Initiation Protocol XML Denial of Service Vulnerability (high 7.5) - [CVE-2019-1684](https://insights.sbomify.com/CVE-2019-1684/): Denial of service in Cisco IP Phone 8800 Series Software (medium 6.5) - [CVE-2021-34711](https://insights.sbomify.com/CVE-2021-34711/): Cisco IP Phone Software Arbitrary File Read Vulnerability (medium 5.5) - [CVE-2019-1922](https://insights.sbomify.com/CVE-2019-1922/): Cisco IP Phone 7800 and 8800 Series Session Initiation Protocol Denial of Service Vulnerability (medium 5.3) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2021-1379 and fix it if it is affected. What it is: CVE-2021-1379 is a medium-severity memory corruption vulnerability in Cisco IP Phones with Multiplatform Firmware, published on 18 Nov 2024. It can only be exploited from the same machine or local network, with no action from the victim. Exploitation: There is no known exploitation of CVE-2021-1379 in the wild and no public exploit code. Affected product: Cisco IP Phones with Multiplatform Firmware. No package-level version data is available, so check the vendor advisory linked from the reference page. Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2021-1379/ (Markdown: https://insights.sbomify.com/CVE-2021-1379/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2021-1379 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-1379 - OSV: https://osv.dev/vulnerability/CVE-2021-1379 --- From sbomify Insights: https://insights.sbomify.com/CVE-2021-1379/ Summaries are generated and may contain mistakes; the official description above is the record.