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NVD / CVE Program· CNA cisco

CVE-2024-20294: A vulnerability in the Link Layer Discovery Protocol (LLDP) feature of Cisco FXOS Software and Cisco NX-OS Software could allow an unauthent

Noroxi assessment

Priority: Monitor (action score 26/100)

  • 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: 0.31% (FIRST EPSS).
  • Someone on the same network segment can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • 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 Link Layer Discovery Protocol (LLDP) feature of Cisco FXOS Software and Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper handling of specific fields in an LLDP frame. An attacker could exploit this vulnerability by sending a crafted LLDP packet to an interface of an affected device and having an authenticated user retrieve LLDP statistics from the affected device through CLI show commands or Simple Network Management Protocol (SNMP) requests. A successful exploit could allow the attacker to cause the LLDP service to crash and stop running on the affected device. In certain situations, the LLDP crash may result in a reload of the affected device. Note: LLDP is a Layer 2 link protocol. To exploit this vulnerability, an attacker would need to be directly connected to an interface of an affected device, either physically or logically (for example, through a Layer 2 Tunnel configured to transport the LLDP protocol).

MediumCVSS 6.6 · v3.1—No exploit No fix recorded
Published
Feb 28, 2024
Updated
Jun 17, 2026
EPSS
0.3% · 24th percentile

Report tools

JSON

Action score

26

Monitor

Low priority for now.

CVSS
26 / 40 · 6.6 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
6.6
CNA · cisco
6.6
agree

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.

Follow CVE-2024-20294

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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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.

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Affected 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.

VendorProduct
ciscofirepower extensible operating system
ciscofirepower 4110
ciscofirepower 4112
ciscofirepower 4115
ciscofirepower 4120
ciscofirepower 4125
ciscofirepower 4140
ciscofirepower 4145
ciscofirepower 4150
ciscofirepower 9300 sm-24
ciscofirepower 9300 sm-36
ciscofirepower 9300 sm-40

and 188 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • cisco firepower extensible operating system2.10.1.159
  • cisco firepower extensible operating system2.10.1.166
  • cisco firepower extensible operating system2.10.1.179
  • cisco firepower extensible operating system2.10.1.207
  • cisco firepower extensible operating system2.10.1.234
  • cisco firepower extensible operating system2.10.1.245
  • cisco firepower extensible operating system2.10.1.271
  • cisco firepower extensible operating system2.11.1.154
  • cisco firepower extensible operating system2.11.1.182
  • cisco firepower extensible operating system2.11.1.200
  • cisco firepower extensible operating system2.11.1.205
  • cisco firepower extensible operating system2.12.0.31
  • cisco firepower extensible operating system2.12.0.432
  • cisco firepower extensible operating system2.12.0.450
  • cisco firepower extensible operating system2.12.0.467
  • cisco firepower extensible operating system2.12.0.498
  • cisco firepower extensible operating system2.12.1.29
  • cisco firepower extensible operating system2.12.1.48
  • cisco firepower extensible operating system2.13.0.198
  • cisco firepower extensible operating system2.13.0.212

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, 2.2.2.71, 2.2.2.83 … (+28)affected

  • Cisco Cisco NX-OS Software

    • 6.0(2)A3(1), 6.0(2)A3(2), 6.0(2)A3(4), 6.0(2)A4(1), 6.0(2)A4(2), 6.0(2)A4(3), 6.0(2)A4(4), 6.0(2)A4(5), 6.0(2)A4(6), 6.0(2)A6(1), 6.0(2)A6(1a), 6.0(2)A6(2) … (+28)affected

  • Cisco Cisco NX-OS System Software in ACI Mode

    • 12.0(1m), 12.0(2g), 12.0(1n), 12.0(1o), 12.0(1p), 12.0(1q), 12.0(2h), 12.0(2l), 12.0(2m), 12.0(2n), 12.0(2o), 12.0(2f) … (+28)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 records

Other highest-scoring records for the same primary product.

  • CVE-2015-6435An unspecified CGI script in Cisco FX-OS before 1.1.2 on Firepower 9000 devices and Cisco Unified Computing System (UCS) Manager before 2.2(
    42Plan
  • CVE-2020-3172Cisco FXOS and NX-OS Software Cisco Discovery Protocol Arbitrary Code Execution and Denial of Service Vulnerability
    36Monitor
  • CVE-2017-12277A vulnerability in the Smart Licensing Manager service of the Cisco Firepower 4100 Series Next-Generation Firewall (NGFW) and Firepower 9300
    36Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2020-3459Oct 21, 2020 · Cisco FXOS Software for Firepower 4100/9300 Series Command Injection Vulnerability
    31Monitor
  • ← EarlierCVE-2022-20625Feb 23, 2022 · Cisco FXOS and NX-OS Software Cisco Discovery Protocol Service Denial of Service Vulnerability
    18Monitor
  • ← EarlierCVE-2023-20234Aug 23, 2023 · A vulnerability in the CLI of Cisco FXOS Software could allow an authenticated, local attacker to create a file or overwrite any file on the
    24Monitor

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 researchers

Finders, 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.

All national notices →

Technical details

Attack conditions

  • Someone on the same network segment can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Adjacent
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-805 · Buffer Access with Incorrect Length Value

CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:R/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.

ATT&CK techniques

—

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.

All records