NVD / CVE Program· CNA cisco

CVE-2024-20502: A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series Teleworker Gateway devices could allow an…

HighCVSS 7.5 · v3.1—No exploit No fix recorded

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: 0.52% (FIRST EPSS).
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 Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series Teleworker Gateway devices could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to insufficient resource management while establishing SSL VPN sessions. An attacker could exploit this vulnerability by sending a series of crafted HTTPS requests to the VPN server of an affected device. A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to stop accepting new connections, preventing new SSL VPN connections from being established. Existing SSL VPN sessions are not impacted. Note: When the attack traffic stops, the Cisco AnyConnect VPN server recovers gracefully without requiring manual intervention.

BDU:2025-07152

Published: Oct 2, 2024
Updated: Jun 17, 2026
EPSS: 0.5% · 44th percentile
CWE: CWE-400

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 30 / 40 · 7.5 / 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: 7.5
CNA · cisco: 5.8; 1.7 point gap

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L

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.

Is your version affected? Check it

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.

Vendor	Product	CPE
cisco	meraki mx65 firmware	cpe:2.3:o:cisco:meraki_mx65_firmware
cisco	meraki mx65	cpe:2.3:h:cisco:meraki_mx65
cisco	meraki mx64 firmware	cpe:2.3:o:cisco:meraki_mx64_firmware
cisco	meraki mx64	cpe:2.3:h:cisco:meraki_mx64
cisco	meraki z4c firmware	cpe:2.3:o:cisco:meraki_z4c_firmware
cisco	meraki z4c	cpe:2.3:h:cisco:meraki_z4c
cisco	meraki z4 firmware	cpe:2.3:o:cisco:meraki_z4_firmware
cisco	meraki z4	cpe:2.3:h:cisco:meraki_z4
cisco	meraki z3c firmware	cpe:2.3:o:cisco:meraki_z3c_firmware
cisco	meraki z3c	cpe:2.3:h:cisco:meraki_z3c
cisco	meraki z3 firmware	cpe:2.3:o:cisco:meraki_z3_firmware
cisco	meraki z3	cpe:2.3:h:cisco:meraki_z3

and 38 more

Affected versions

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

cisco meraki mx100 firmware16.2 and later · before 18.211.2
cisco meraki mx105 firmware16.2 and later · before 18.211.2
cisco meraki mx250 firmware16.2 and later · before 18.211.2
cisco meraki mx400 firmware16.2 and later · before 18.211.2
cisco meraki mx450 firmware16.2 and later · before 18.211.2
cisco meraki mx600 firmware16.2 and later · before 18.211.2
cisco meraki mx64 firmware17.6.0 and later · before 18.211.2
cisco meraki mx64w firmware16.2 and later · before 18.211.2
cisco meraki mx65 firmware17.6.0 and later · before 18.211.2
cisco meraki mx65w firmware16.2 and later · before 18.211.2
cisco meraki mx67 firmware16.2 and later · before 18.211.2
cisco meraki mx67c firmware16.2 and later · before 18.211.2
cisco meraki mx67w firmware16.2 and later · before 18.211.2
cisco meraki mx68 firmware16.2 and later · before 18.211.2
cisco meraki mx68cw firmware16.2 and later · before 18.211.2
cisco meraki mx68w firmware16.2 and later · before 18.211.2
cisco meraki mx75 firmware16.2 and later · before 18.211.2
cisco meraki mx84 firmware16.2 and later · before 18.211.2
cisco meraki mx85 firmware16.2 and later · before 18.211.2
cisco meraki mx95 firmware16.2 and later · before 18.211.2

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 Meraki MX Firmware
- N/Aaffected

Same product

cisco: all records

Other highest-scoring records for the same primary product.

CVE-2024-20501Multiple vulnerabilities in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series Teleworker Gateway devices could…
30Monitor
CVE-2024-20498Multiple vulnerabilities in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series Teleworker Gateway devices could…
30Monitor
CVE-2024-20509A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series Teleworker Gateway devices could allow an…
23Monitor

Published before and after this one in the same product

Later →CVE-2024-20513Oct 2, 2024 · A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series Teleworker Gateway devices could allow an…
21Monitor

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.

TR-24-1593 · Oct 3, 2024(Cisco Çoklu Ürün Güvenlik Bildirimi)

All national notices →

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-400 · Uncontrolled Resource Consumption

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Root cause

Code that parses nested structures sets no depth or size limit. A small input can turn into a disproportionate processing load.

The bug in code

The whole CWE-400 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1function expand(node) {
2  return node.children.map(expand);
3}

Fixed

1const MAX_DEPTH = 32;
2function expand(node, depth = 0) {
3  if (depth > MAX_DEPTH) throw new Error("too deep");
4  return node.children.map((c) => expand(c, depth + 1));
5}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

Endpoint Denial of ServiceT1499

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-meraki-mx-vpn-dos-QTRHzG2

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records