Cisco IP Phone 7800 and 8800 Series Session Initiation Protocol Denial of Service Vulnerability
Noroxi assessment
Priority: Monitor (action score 30/100)
- 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: 1.3% (FIRST EPSS); higher than 70.2% of all records.
- Anyone who can reach it over the internet 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.
- Severity is disputed: the assigning authority (CNA) scores it 5.3, NVD 7.5.
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 Cisco SIP IP Phone Software for Cisco IP Phone 7800 Series and 8800 Series could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected phone. The vulnerability is due to insufficient validation of input Session Initiation Protocol (SIP) packets. An attacker could exploit this vulnerability by altering the SIP replies that are sent to the affected phone during the registration process. A successful exploit could allow the attacker to cause the phone to reboot and not complete the registration process.
- Published
- Jul 5, 2019
- Updated
- Jun 16, 2026
- EPSS
- 1.3% · 70th percentile
- CWE
- CWE-476
Report tools
Action score
30
Monitor
Low priority for now.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 1.3%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 7.5
- CNA · cisco
- 5.3
- 2.2 point gap
CVSS:3.0/AV:N/AC:H/PR:N/UI:R/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.
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 | 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 |
| cisco | ip phone 7841 firmware | cpe:2.3:o:cisco:ip_phone_7841_firmware |
| cisco | ip phone 7841 | cpe:2.3:h:cisco:ip_phone_7841 |
| cisco | ip phone 7861 firmware | cpe:2.3:o:cisco:ip_phone_7861_firmware |
| cisco | ip phone 7861 | cpe:2.3:h:cisco:ip_phone_7861 |
and 12 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 firmwareall versions
- cisco ip conference phone 8832 firmware11.5(1)
- cisco ip conference phone 8832 firmware12.5(1)
- cisco ip phone 7811 firmwareall versions
- cisco ip phone 7821 firmwareall versions
- cisco ip phone 7841 firmwareall versions
- cisco ip phone 7861 firmwareall versions
- cisco ip phone 8811 firmware11.5(1)
- cisco ip phone 8811 firmware12.5(1)
- cisco ip phone 8841 firmware11.5(1)
- cisco ip phone 8841 firmware12.5(1)
- cisco ip phone 8845 firmware11.5(1)
- cisco ip phone 8845 firmware12.5(1)
- cisco ip phone 8851 firmware11.5(1)
- cisco ip phone 8851 firmware12.5(1)
- cisco ip phone 8861 firmware11.5(1)
- cisco ip phone 8861 firmware12.5(1)
- cisco ip phone 8865 firmware11.5(1)
- cisco ip phone 8865 firmware12.5(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 8800 Series Software
- unspecified and later · before 12.0(1)MN130affected
Same product
cisco: all recordsOther highest-scoring records for the same primary product.
- CVE-2020-3111Cisco IP Phone Remote Code Execution and Denial of Service Vulnerability36Monitor
- CVE-2019-1635Cisco IP Phone 7800 Series and 8800 Series Session Initiation Protocol XML Denial of Service Vulnerability31Monitor
- CVE-2021-1379Cisco IP Phones Cisco Discovery Protocol and Link Layer Discovery Protocol Remote Code Execution and Denial of Service Vulnerabilities26Monitor
- CVE-2021-34711Cisco IP Phone Software Arbitrary File Read Vulnerability22Monitor
- CVE-2022-20660Cisco 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
- Anyone who can reach it over the internet 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
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-476 · NULL Pointer DereferenceCVSS vector
CVSS:3.0/AV:N/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.
Change log
No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.
References
Vendor advisories and official records. Exploit/PoC links are deliberately left out.