CVE-2023-20200: A vulnerability in the Simple Network Management Protocol (SNMP) service of Cisco FXOS Software for Firepower 4100 Series and Firepower 9300
Noroxi assessment
Priority: Monitor (action score 25/100)
- 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: 0.68% (FIRST EPSS); higher than 52.7% of all records.
- Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
- According to the record, no fixed version is available yet.
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 Simple Network Management Protocol (SNMP) service of Cisco FXOS Software for Firepower 4100 Series and Firepower 9300 Security Appliances and of Cisco UCS 6300 Series Fabric Interconnects could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to the improper handling of specific SNMP requests. An attacker could exploit this vulnerability by sending a crafted SNMP request to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Note: This vulnerability affects all supported SNMP versions. To exploit this vulnerability through SNMPv2c or earlier, an attacker must know the SNMP community string that is configured on an affected device. To exploit this vulnerability through SNMPv3, the attacker must have valid credentials for an SNMP user who is configured on the affected device.
- Published
- Aug 23, 2023
- Updated
- Jun 17, 2026
- EPSS
- 0.6% · 52th percentile
- CWE
- CWE-835
Report tools
Action score
25
Monitor
Low priority for now.
- CVSS
- 25 / 40 · 6.3 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.6%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 6.3
- CNA · cisco
- 7.7
- 1.4 point gap
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/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 | firepower 9300 firmware | cpe:2.3:o:cisco:firepower_9300_firmware |
| cisco | firepower 9300 | cpe:2.3:h:cisco:firepower_9300 |
| cisco | firepower 4143 firmware | cpe:2.3:o:cisco:firepower_4143_firmware |
| cisco | firepower 4145 | cpe:2.3:h:cisco:firepower_4145 |
| cisco | firepower 4112 firmware | cpe:2.3:o:cisco:firepower_4112_firmware |
| cisco | firepower 4112 | cpe:2.3:h:cisco:firepower_4112 |
| cisco | ucs 6324 fabric interconnect firmware | cpe:2.3:o:cisco:ucs_6324_fabric_interconnect_firmware |
| cisco | ucs 6324 fabric interconnect | cpe:2.3:h:cisco:ucs_6324_fabric_interconnect |
| cisco | firepower 4125 firmware | cpe:2.3:o:cisco:firepower_4125_firmware |
| cisco | firepower 4125 | cpe:2.3:h:cisco:firepower_4125 |
| cisco | firepower 4115 | cpe:2.3:o:cisco:firepower_4115 |
| cisco | ucs 6332 fabric interconnect firmware | cpe:2.3:o:cisco:ucs_6332_fabric_interconnect_firmware |
and 3 more
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- cisco firepower 4112 firmwareall versions
- cisco firepower 4115all versions
- cisco firepower 4125 firmwareall versions
- cisco firepower 4143 firmwareall versions
- cisco firepower 9300 firmwareall versions
- cisco ucs 6324 fabric interconnect firmware4.2 and later · before 4.2\(3d\)
- cisco ucs 6324 fabric interconnect firmware4.1 and later · before 4.1\(3l\)
- cisco ucs 6332 fabric interconnect firmware4.1 and later · before 4.1\(3l\)
- cisco ucs 6332 fabric interconnect firmware4.2 and later · up to 4.2\(3b\) inclusive
- cisco ucs 6332-16up fabric interconnect firmware4.1 and later · before 4.1\(3l\)
- cisco ucs 6332-16up fabric interconnect firmware4.2 and later · before 4.2\(3b\)
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 Firepower Extensible Operating System (FXOS)
- 2.2.1.63, 2.2.1.66, 2.2.1.70, 2.2.2.17, 2.2.2.19, 2.2.2.24, 2.2.2.26, 2.2.2.28, 2.2.2.54, 2.2.2.60, 2.3.1.93, 2.3.1.91 … (+6)affected
Cisco Cisco Unified Computing System (Managed)
- 3.1(1e), 3.1(1g), 3.1(1h), 3.1(1k), 3.1(1l), 3.1(2b), 3.1(2c), 3.1(2e), 3.1(2f), 3.1(2g), 3.1(2h), 3.1(3a) … (+28)affected
Same product
cisco: all recordsOther highest-scoring records for the same primary product.
- CVE-2019-12699Cisco FXOS Software and Firepower Threat Defense Software Command Injection Vulnerabilities31Monitor
- CVE-2019-12700Cisco FTD, FMC, and FXOS Software Pluggable Authentication Module Denial of Service Vulnerability27Monitor
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).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- A low-privileged account is enough.
- No user action is required.
- Special conditions such as timing or configuration are required.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
Impact can extend beyond the vulnerable component (scope changes).
- Attack vector
- Network
- Attack complexity
- High
- Privileges required
- Low
- User interaction
- None
- Scope
- Changed
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop')CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/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.