Cisco IP Phone 7800 Series and 8800 Series Session Initiation Protocol XML Denial of Service Vulnerability
A vulnerability in the call-handling functionality of Session Initiation Protocol (SIP) Software for Cisco IP Phone 7800 Series and 8800 Series could allow an unauthenticated, remote attacker to cause an affected phone to reload unexpectedly, resulting in a temporary denial of service (DoS) condition. The vulnerability is due to incomplete error handling when XML data within a SIP packet is parsed. An attacker could exploit this vulnerability by sending a SIP packet that contains a malicious XML payload to an affected phone. A successful exploit could allow the attacker to cause the affected phone to reload unexpectedly, resulting in a temporary DoS condition.
- Published
- May 3, 2019
- Updated
- Jun 16, 2026
- EPSS
- 2.0% · 80th percentile
- CWE
- CWE-399
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Report tools
Action score
31
Monitor
Low priority for now.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 2.0%
CISA SSVC decision
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 7.5
- CNA · cisco
- 7.5
- agree
CVSS:3.0/AV:N/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.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; 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 helpAffected systems
| 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 20 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 firmware10.3(1)sr4b
- cisco ip conference phone 7832 firmware11.0(4)sr2
- cisco ip conference phone 7832 firmware12.1(1)sr1
- cisco ip conference phone 7832 firmware9.3(4)sr3
- cisco ip conference phone 8832 firmware10.3(1)sr4b
- cisco ip conference phone 8832 firmware11.0(4)sr2
- cisco ip conference phone 8832 firmware12.1(1)sr1
- cisco ip conference phone 8832 firmware9.3(4)sr3
- cisco ip phone 7811 firmware10.3(1)sr4b
- cisco ip phone 7811 firmware11.0(4)sr2
- cisco ip phone 7811 firmware12.1(1)sr1
- cisco ip phone 7811 firmware9.3(4)sr3
- cisco ip phone 7821 firmware10.3(1)sr4b
- cisco ip phone 7821 firmware11.0(4)sr2
- cisco ip phone 7821 firmware12.1(1)sr1
- cisco ip phone 7821 firmware9.3(4)sr3
- cisco ip phone 7841 firmware10.3(1)sr4b
- cisco ip phone 7841 firmware11.0(4)sr2
- cisco ip phone 7841 firmware12.1(1)sr1
- cisco ip phone 7841 firmware9.3(4)sr3
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 7800 Series and 8800 Series
- unspecified and later · before 12.5(1)affected
Cisco Cisco Wireless IP Phone 8821 and 8821-EX
- unspecified and later · before 11.0(5)affected
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-2019-1922Cisco 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
- 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).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-19-049 · May 1, 2019(Cisco Güvenlik Güncellemesi Yayınladı)
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-399 · Resource Management ErrorsCVSS vector
CVSS:3.1/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.