Zavio IP Camera Stack-Based Buffer Overflow
Zavio CF7500, CF7300, CF7201, CF7501, CB3211, CB3212, CB5220, CB6231, B8520, B8220, and CD321 IP Cameras with firmware version M2.1.6.05 has a command injection vulnerability in their implementation of their binaries and handling of network requests.
- Published
- Nov 8, 2023
- Updated
- Jun 17, 2026
- EPSS
- 12.9% · 96th percentile
- CWE
- CWE-121
Sign in to follow · You’ll be notified if a followed record enters KEV, gets an exploit or is updated.
Report tools
Action score
43
Plan
Add it to your regular patch cycle.
- CVSS
- 39 / 40 · 9.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 4 / 30 · 12.9%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 9.8
- CNA · icscert
- 8.8
- 1.0 point gap
CVSS:3.1/AV:N/AC:L/PR:L/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.
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 |
|---|---|---|
| zavio | cd321 firmware | cpe:2.3:o:zavio:cd321_firmware |
| zavio | cd321 | cpe:2.3:h:zavio:cd321 |
| zavio | b8520 | cpe:2.3:h:zavio:b8520 |
| zavio | b8220 firmware | cpe:2.3:o:zavio:b8220_firmware |
| zavio | b8220 | cpe:2.3:h:zavio:b8220 |
| zavio | cf7500 firmware | cpe:2.3:o:zavio:cf7500_firmware |
| zavio | cf7500 | cpe:2.3:h:zavio:cf7500 |
| zavio | cf7300 firmware | cpe:2.3:o:zavio:cf7300_firmware |
| zavio | cf7300 | cpe:2.3:h:zavio:cf7300 |
| zavio | cf7201 firmware | cpe:2.3:o:zavio:cf7201_firmware |
| zavio | cf7201 | cpe:2.3:h:zavio:cf7201 |
| zavio | cf7501 firmware | cpe:2.3:o:zavio:cf7501_firmware |
and 10 more
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- zavio b8220 firmwarem2.1.6.05
- zavio b8520 firmwarem2.1.6.05
- zavio cb3211 firmwarem2.1.6.05
- zavio cb3212 firmwarem2.1.6.05
- zavio cb5220 firmwarem2.1.6.05
- zavio cb6231 firmwarem2.1.6.05
- zavio cd321 firmwarem2.1.6.05
- zavio cf7201 firmwarem2.1.6.05
- zavio cf7300 firmwarem2.1.6.05
- zavio cf7500 firmwarem2.1.6.05
- zavio cf7501 firmwarem2.1.6.05
Versions reported by the vendor
Affected version ranges reported by the assigning authority (icscert). Independent of NVD's CPE analysis and usually ahead of it.
Zavio IP Camera B8220
- version M2.1.6.05affected
Zavio IP Camera B8520
- version M2.1.6.05affected
Zavio IP Camera CB3211
- version M2.1.6.05affected
Zavio IP Camera CB3212
- version M2.1.6.05affected
Zavio IP Camera CB5220
- version M2.1.6.05affected
Zavio IP Camera CB6231
- version M2.1.6.05affected
Zavio IP Camera CD321
- version M2.1.6.05affected
Zavio IP Camera CF7201
- version M2.1.6.05affected
Zavio IP Camera CF7300
- version M2.1.6.05affected
Zavio IP Camera CF7500
- version M2.1.6.05affected
Zavio IP Camera CF7501
- version M2.1.6.05affected
Same product
zavio: all recordsOther highest-scoring records for the same primary product.
- CVE-2023-3959Zavio IP Camera Stack-Based Buffer Overflow54Plan
- CVE-2023-45225Zavio IP Camera Stack-Based Buffer Overflow39Monitor
- CVE-2023-43755Zavio IP Camera Stack-Based Buffer Overflow39Monitor
- CVE-2023-39435Zavio IP Camera Stack-Based Buffer Overflow39Monitor
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.
- Attila Szaszfinder
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
- CVE-2023-39590 days apartZavio IP Camera Stack-Based Buffer Overflow54Plan
- CVE-2023-394350 days apartZavio IP Camera Stack-Based Buffer Overflow39Monitor
- CVE-2023-437550 days apartZavio IP Camera Stack-Based Buffer Overflow39Monitor
- CVE-2023-452250 days apartZavio IP Camera Stack-Based Buffer Overflow39Monitor
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-23-0500 · Sep 8, 2023(Zavio 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
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-121 · Stack-based Buffer OverflowCVSS vector
CVSS:3.1/AV:N/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.
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.