Multiple Cisco products are affected by a vulnerability in the Snort 3 Detection Engine that could allow an unauthenticated, remote attacker
Multiple Cisco products are affected by a vulnerability in the Snort 3 Detection Engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection. This vulnerability is due to incomplete parsing of the SSL handshake ingress packets. An attacker could exploit this vulnerability by sending crafted SSL handshake packets. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when the Snort 3 Detection Engine restarts unexpectedly.
- Published
- Mar 4, 2026
- Updated
- Sep 1, 2026
- EPSS
- 0.5% · 42th percentile
- CWE
- CWE-392
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Report tools
Action score
23
Monitor
Low priority for now.
- CVSS
- 23 / 40 · 5.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.5%
CISA SSVC decision
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · cisco
- 5.8
- 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.
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 | cyber vision | cpe:2.3:a:cisco:cyber_vision |
| cisco | secure firewall threat defense | cpe:2.3:a:cisco:secure_firewall_threat_defense |
| cisco | unified threat defense snort intrusion prevention system engine | cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine |
| cisco | snort | cpe:2.3:a:cisco:snort |
| cisco | meraki mx100 | cpe:2.3:h:cisco:meraki_mx100 |
| cisco | meraki mx105 | cpe:2.3:h:cisco:meraki_mx105 |
| cisco | meraki mx250 | cpe:2.3:h:cisco:meraki_mx250 |
| cisco | meraki mx400 | cpe:2.3:h:cisco:meraki_mx400 |
| cisco | meraki mx450 | cpe:2.3:h:cisco:meraki_mx450 |
| cisco | meraki mx600 | cpe:2.3:h:cisco:meraki_mx600 |
| cisco | meraki mx64 | cpe:2.3:h:cisco:meraki_mx64 |
| cisco | meraki mx64w | cpe:2.3:h:cisco:meraki_mx64w |
and 11 more
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- cisco cyber vision3.0.0
- cisco cyber vision3.0.1
- cisco cyber vision3.0.2
- cisco cyber vision3.0.3
- cisco cyber vision3.0.4
- cisco cyber vision3.0.5
- cisco cyber vision3.0.6
- cisco cyber vision3.1.0
- cisco cyber vision3.1.1
- cisco cyber vision3.1.2
- cisco cyber vision3.2.0
- cisco cyber vision3.2.1
- cisco cyber vision3.2.2
- cisco cyber vision3.2.3
- cisco cyber vision3.2.4
- cisco cyber vision4.0.0
- cisco cyber vision4.0.1
- cisco cyber vision4.0.2
- cisco cyber vision4.0.3
- cisco cyber vision4.1.0
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 Cyber Vision
- 3.0.4, 3.0.0, 3.0.1, 3.0.2, 3.0.3, 3.0.5, 3.0.6, 3.1.0, 3.1.2, 3.1.1, 3.2.3, 3.2.1 … (+28)affected
Cisco Cisco Secure Firewall Threat Defense (FTD) Software
- 7.6.0, 7.6.1, 7.6.2, 7.6.2.1, 7.7.0, 7.7.10, 7.7.10.1affected
Cisco Cisco UTD SNORT IPS Engine Software
- 17.2.1r, 17.3.1a, 17.3.2, 17.3.3, 17.3.4a, 17.3.6, 17.3.5, 17.3.7, 17.3.8, 17.4.1a, 17.4.2, 17.4.1b … (+28)affected
Same product
cisco: all recordsOther highest-scoring records for the same primary product.
- CVE-2022-20685Multiple Cisco Products Snort Modbus Denial of Service Vulnerability30Monitor
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
- low · the service can be disrupted
Impact can extend beyond the vulnerable component (scope changes).
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- Low
Weakness class (CWE)
CWE-392 · Missing Report of Error ConditionCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
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.