CVE-2024-20376: A vulnerability in the web-based management interface of Cisco IP Phone firmware could allow an unauthenticated, remote attacker to cause an
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: 0.88% (FIRST EPSS); higher than 59.3% 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 CISA the attack is automatable: targets can be found by mass scanning.
- According to the record, no fixed version is available yet.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
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 web-based management interface of Cisco IP Phone firmware could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a DoS condition. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sending a crafted request to the web-based management interface of an affected device. A successful exploit could allow the attacker to cause the affected device to reload.
- Published
- May 1, 2024
- Updated
- Jun 17, 2026
- EPSS
- 0.8% · 59th percentile
- CWE
- CWE-787
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 · 0.8%
CISA SSVC decision
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · cisco
- 7.5
- NVD has not scored this yet; the score shown is the CNA’s.
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 | video phone 8875 firmware | cpe:2.3:o:cisco:video_phone_8875_firmware |
| cisco | video phone 8875 | cpe:2.3:h:cisco:video_phone_8875 |
| cisco | ip phone 6821 with multiplatform firmware | cpe:2.3:o:cisco:ip_phone_6821_with_multiplatform_firmware |
| cisco | ip phone 6821 | cpe:2.3:h:cisco:ip_phone_6821 |
| cisco | ip phone 6841 with multiplatform firmware | cpe:2.3:o:cisco:ip_phone_6841_with_multiplatform_firmware |
| cisco | ip phone 6841 | cpe:2.3:h:cisco:ip_phone_6841 |
| cisco | ip phone 6851 with multiplatform firmware | cpe:2.3:o:cisco:ip_phone_6851_with_multiplatform_firmware |
| cisco | ip phone 6851 | cpe:2.3:h:cisco:ip_phone_6851 |
| cisco | ip phone 6861 with multiplatform firmware | cpe:2.3:o:cisco:ip_phone_6861_with_multiplatform_firmware |
| cisco | ip phone 6861 | cpe:2.3:h:cisco:ip_phone_6861 |
| cisco | ip phone 6871 with multiplatform firmware | cpe:2.3:o:cisco:ip_phone_6871_with_multiplatform_firmware |
| cisco | ip phone 6871 | cpe:2.3:h:cisco:ip_phone_6871 |
and 24 more
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- cisco ip phone 6821 with multiplatform firmwareup to 12.0.4 inclusive
- cisco ip phone 6841 with multiplatform firmwareup to 12.0.4 inclusive
- cisco ip phone 6851 with multiplatform firmwareup to 12.0.4 inclusive
- cisco ip phone 6861 with multiplatform firmwareup to 12.0.4 inclusive
- cisco ip phone 6871 with multiplatform firmwareup to 12.0.4 inclusive
- cisco ip phone 7811 with multiplatform firmwareup to 12.0.4 inclusive
- cisco ip phone 7821 with multiplatform firmwareup to 12.0.4 inclusive
- cisco ip phone 7832 with multiplatform firmwareup to 12.0.4 inclusive
- cisco ip phone 7841 with multiplatform firmwareup to 12.0.4 inclusive
- cisco ip phone 7861 with multiplatform firmwareup to 12.0.4 inclusive
- cisco ip phone 8811 with multiplatform firmwareup to 12.0.4 inclusive
- cisco ip phone 8832 with multiplatform firmwareup to 12.0.4 inclusive
- cisco ip phone 8841 with multiplatform firmwareup to 12.0.4 inclusive
- cisco ip phone 8845 with multiplatform firmwareup to 12.0.4 inclusive
- cisco ip phone 8851 with multiplatform firmwareup to 12.0.4 inclusive
- cisco ip phone 8861 with multiplatform firmwareup to 12.0.4 inclusive
- cisco ip phone 8865 with multiplatform firmwareup to 12.0.4 inclusive
- cisco video phone 8875 firmwarebefore 2.3.1.0101
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 Phones with Multiplatform Firmware
- 11.3.1 MSR2-6, 11.3.1 MSR3-3, 11.3.2, 11.3.3, 11.3.1 MSR4-1, 11.3.4, 11.3.5, 11.3.3 MSR2, 11.3.3 MSR1, 11.3.6, 11-3-1MPPSR4UPG, 11.3.7 … (+28)affected
Cisco Cisco PhoneOS
- 1.0.1, 2.1.1, 2.0.1, 2.3.1affected
Same product
cisco: all recordsOther highest-scoring records for the same primary product.
- CVE-2023-20221A vulnerability in the web-based management interface of Cisco IP Phone 6800, 7800, and 8800 Series with Multiplatform Firmware could allow 26Monitor
- CVE-2025-20158Cisco Video Phone 8875 and Desk Phone 9800 Series Information Disclosure Vulnerability17Monitor
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.
No history yet (it accumulates with the daily EPSS job).
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-24-0390 · May 2, 2024(Cisco Güvenlik Bildirimi)
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-787 · Out-of-bounds WriteCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvd-secondary
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.