Cisco IP Phone 7800 and 8800 Series Cisco Discovery Protocol and Link Layer Discovery Protocol Denial of Service Vulnerability
A vulnerability in the Cisco Discovery Protocol or Link Layer Discovery Protocol (LLDP) implementation for the Cisco IP Phone 7800 and 8800 Series could allow an unauthenticated, adjacent attacker to cause an affected phone to reload unexpectedly, resulting in a temporary denial of service (DoS) condition. The vulnerability is due to missing length validation of certain Cisco Discovery Protocol or LLDP packet header fields. An attacker could exploit this vulnerability by sending a malicious Cisco Discovery Protocol or LLDP packet to the targeted phone. A successful exploit could allow the attacker to cause the affected phone to reload unexpectedly, resulting in a temporary DoS condition. Versions prior to 12.6(1)MN80 are affected.
- Published
- Feb 21, 2019
- Updated
- Jun 16, 2026
- EPSS
- 0.6% · 49th percentile
- CWE
- CWE-399
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Report tools
Action score
26
Monitor
Low priority for now.
- CVSS
- 26 / 40 · 6.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.6%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 6.5
- CNA · cisco
- 6.5
- agree
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| cisco | ip phone 8800 firmware | cpe:2.3:o:cisco:ip_phone_8800_firmware |
| cisco | ip phone 8800 | cpe:2.3:h:cisco:ip_phone_8800 |
| cisco | ip phone 7800 firmware | cpe:2.3:o:cisco:ip_phone_7800_firmware |
| cisco | ip phone 7800 | cpe:2.3:h:cisco:ip_phone_7800 |
| cisco | ip conference phone 7832 firmware | cpe:2.3:o:cisco:ip_conference_phone_7832_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 | cpe:2.3:h:cisco:ip_conference_phone_8832 |
| cisco | ip phone 7811 firmware | cpe:2.3:o:cisco:ip_phone_7811_firmware |
| cisco | ip phone 7811 | cpe:2.3:h:cisco:ip_phone_7811 |
| cisco | ip phone 7821 firmware | cpe:2.3:o:cisco:ip_phone_7821_firmware |
| cisco | ip phone 7821 | cpe:2.3:h:cisco:ip_phone_7821 |
and 16 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 12.6\(1\)mn80
- cisco ip conference phone 8832 firmwarebefore 12.6\(1\)mn80
- cisco ip phone 7800 firmwarebefore 12.6\(1\)mn80
- cisco ip phone 7811 firmwarebefore 12.6\(1\)mn80
- cisco ip phone 7821 firmwarebefore 12.6\(1\)mn80
- cisco ip phone 7841 firmwarebefore 12.6\(1\)mn80
- cisco ip phone 7861 firmwarebefore 12.6\(1\)mn80
- cisco ip phone 8800 firmwarebefore 12.6\(1\)mn80
- cisco ip phone 8811 firmwarebefore 12.6\(1\)mn80
- cisco ip phone 8841 firmwarebefore 12.6\(1\)mn80
- cisco ip phone 8845 firmwarebefore 12.6\(1\)mn80
- cisco ip phone 8851 firmwarebefore 12.6\(1\)mn80
- cisco ip phone 8861 firmwarebefore 12.6\(1\)mn80
- cisco ip phone 8865 firmwarebefore 12.6\(1\)mn80
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 8800 Series Software
- unspecified and later · before 12.6(1)MN80affected
Same product
cisco: all recordsOther highest-scoring records for the same primary product.
- CVE-2018-0325A vulnerability in the Session Initiation Protocol (SIP) call-handling functionality of Cisco IP Phone 7800 Series phones and Cisco IP Phone31Monitor
- CVE-2019-1766Cisco IP Phone 8800 Series File Upload Denial of Service Vulnerability30Monitor
- CVE-2021-33478The TrustZone implementation in certain Broadcom MediaxChange firmware could allow an unauthenticated, physically proximate attacker to achi27Monitor
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
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Adjacent
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-399 · Resource Management ErrorsCVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.
References
- www.securityfocus.com/bid/107104
- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190220-cdp-lldp-dos
Vendor advisories and official records. Exploit/PoC links are deliberately left out.