Cisco IP Phone Remote Code Execution and Denial of Service Vulnerability
Noroxi assessment
Priority: Monitor (action score 36/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 3% (FIRST EPSS); higher than 87.6% of all records.
- Someone on the same network segment can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
- According to the record, no fixed version is available yet.
Low priority for now. Update when a fix is released; follow the vendor's advisory.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
A vulnerability in the Cisco Discovery Protocol implementation for the Cisco IP Phone could allow an unauthenticated, adjacent attacker to remotely execute code with root privileges or cause a reload of an affected IP phone. The vulnerability is due to missing checks when processing Cisco Discovery Protocol messages. An attacker could exploit this vulnerability by sending a crafted Cisco Discovery Protocol packet to the targeted IP phone. A successful exploit could allow the attacker to remotely execute code with root privileges or cause a reload of an affected IP phone, resulting in a denial of service (DoS) condition. Cisco Discovery Protocol is a Layer 2 protocol. To exploit this vulnerability, an attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent).
- Published
- Feb 5, 2020
- Updated
- Jun 16, 2026
- EPSS
- 3.0% · 87th percentile
- CWE
- CWE-20
Report tools
Action score
36
Monitor
Low priority for now.
- CVSS
- 35 / 40 · 8.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 3.0%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 8.8
- CNA · cisco
- 8.8
- agree
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- No fixed version yet
If any of these changes, we'll tell you in the daily email digest.
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Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| cisco | ip conference phone 7832 firmware | cpe:2.3:o:cisco:ip_conference_phone_7832_firmware |
| cisco | ip conference phone 7832 with multiplatform firmware | cpe:2.3:o:cisco:ip_conference_phone_7832_with_multiplatform_firmware |
| cisco | ip conference phone 7832 | cpe:2.3:h:cisco:ip_conference_phone_7832 |
| cisco | ip conference phone 8832 firmware | cpe:2.3:o:cisco:ip_conference_phone_8832_firmware |
| cisco | ip conference phone 8832 with multiplatform firmware | cpe:2.3:o:cisco:ip_conference_phone_8832_with_multiplatform_firmware |
| cisco | ip conference phone 8832 | cpe:2.3:h:cisco:ip_conference_phone_8832 |
| cisco | ip phone 6821 firmware | cpe:2.3:o:cisco:ip_phone_6821_firmware |
| cisco | ip phone 6821 | cpe:2.3:h:cisco:ip_phone_6821 |
| cisco | ip phone 6841 firmware | cpe:2.3:o:cisco:ip_phone_6841_firmware |
| cisco | ip phone 6841 | cpe:2.3:h:cisco:ip_phone_6841 |
| cisco | ip phone 6851 firmware | cpe:2.3:o:cisco:ip_phone_6851_firmware |
| cisco | ip phone 6851 | cpe:2.3:h:cisco:ip_phone_6851 |
and 42 more
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- cisco ip conference phone 7832 firmwarebefore 12.7\(1\)
- cisco ip conference phone 7832 with multiplatform firmwarebefore 11.3\(1\)sr1
- cisco ip conference phone 8832 firmwarebefore 12.7\(1\)
- cisco ip conference phone 8832 with multiplatform firmwarebefore 11.3\(1\)sr1
- cisco ip phone 6821 firmwarebefore 11.3\(1\)sr1
- cisco ip phone 6841 firmwarebefore 11.3\(1\)sr1
- cisco ip phone 6851 firmwarebefore 11.3\(1\)sr1
- cisco ip phone 6861 firmwarebefore 11.3\(1\)sr1
- cisco ip phone 6871 firmwarebefore 11.3\(1\)sr1
- cisco ip phone 7811 firmwarebefore 12.7\(1\)
- cisco ip phone 7811 with multiplatform firmwarebefore 11.3\(1\)sr1
- cisco ip phone 7821 firmwarebefore 12.7\(1\)
- cisco ip phone 7821 with multiplatform firmwarebefore 11.3\(1\)sr1
- cisco ip phone 7841 firmwarebefore 12.7\(1\)
- cisco ip phone 7841 with multiplatform firmwarebefore 11.3\(1\)sr1
- cisco ip phone 7861 firmwarebefore 12.7\(1\)
- cisco ip phone 7861 with multiplatform firmwarebefore 11.3\(1\)sr1
- cisco ip phone 8811 firmwarebefore 12.7\(1\)
- cisco ip phone 8811 with multiplatform firmwarebefore 11.3\(1\)sr1
- cisco ip phone 8841 firmwarebefore 12.7\(1\)
Versions reported by the vendor
Affected version ranges reported by the assigning authority (cisco). Independent of NVD's CPE analysis and usually ahead of it.
Cisco Cisco IP phone
- unspecified and later · before 12.7(1)affected
Same product
cisco: all recordsOther highest-scoring records for the same primary product.
- CVE-2019-1635Cisco IP Phone 7800 Series and 8800 Series Session Initiation Protocol XML Denial of Service Vulnerability31Monitor
- CVE-2019-1922Cisco IP Phone 7800 and 8800 Series Session Initiation Protocol Denial of Service Vulnerability30Monitor
- CVE-2021-1379Cisco IP Phones Cisco Discovery Protocol and Link Layer Discovery Protocol Remote Code Execution and Denial of Service Vulnerabilities26Monitor
Published before and after this one in the same product
- Later →CVE-2021-34711Oct 6, 2021 · Cisco IP Phone Software Arbitrary File Read Vulnerability22Monitor
- Later →CVE-2022-20660Jan 14, 2022 · Cisco IP Phones Information Disclosure Vulnerability18Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
No fix version is recorded for this entry. Check the references for vendor advisories.
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Someone on the same network segment can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Adjacent
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-20 · Improper Input ValidationCVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Buffer Overflow via Environment VariablesCAPEC-10likelihood: High · High
- Server Side Include (SSI) InjectionCAPEC-101likelihood: High · High
- Cross Zone ScriptingCAPEC-104likelihood: Medium · High
- Command Line Execution through SQL InjectionCAPEC-108likelihood: Low · Very High
- Object Relational Mapping InjectionCAPEC-109likelihood: Low · High
- SQL Injection through SOAP Parameter TamperingCAPEC-110likelihood: High · Very High
- Double EncodingCAPEC-120likelihood: Low · Medium
- Subverting Environment Variable ValuesCAPEC-13likelihood: High · Very High
ATT&CK techniques
- Obfuscated Files or InformationT1027
- Masquerading: Invalid Code SignatureT1036.001
- Steal Web Session CookieT1539
- Subvert Trust Controls: Code SigningT1553.002
- Impair Defenses:Impair Command History LoggingT1562.003
- Hijack Execution Flow:Dynamic Linker HijackingT1574.006
- Hijack Execution Flow:Path Interception by PATH Environment VariableT1574.007
Change log
No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.
References
Show all references (1 more)Show less
Vendor advisories and official records. Exploit/PoC links are deliberately left out.