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CVE-2021-1499· NVD / CVE Program· CNA cisco

Cisco HyperFlex HX Data Platform File Upload Vulnerability

A vulnerability in the web-based management interface of Cisco HyperFlex HX Data Platform could allow an unauthenticated, remote attacker to upload files to an affected device. This vulnerability is due to missing authentication for the upload function. An attacker could exploit this vulnerability by sending a specific HTTP request to an affected device. A successful exploit could allow the attacker to upload files to the affected device with the permissions of the tomcat8 user.

MediumCVSS 5.3 · v3.1—Weaponized No fix recorded
Published
May 6, 2021
Updated
Jun 16, 2026
EPSS
80.4% · 100th percentile
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Report tools

JSON

Action score

45

Plan

Add it to your regular patch cycle.

CVSS
21 / 40 · 5.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
24 / 30 · 80.4%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
5.3
CNA · cisco
5.3
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
ciscohyperflex hx data platform
ciscohyperflex hx220c af m5
ciscohyperflex hx220c all nvme m5
ciscohyperflex hx220c edge m5
ciscohyperflex hx220c m5
ciscohyperflex hx240c
ciscohyperflex hx240c af m5
ciscohyperflex hx240c m5

Affected versions

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

  • cisco hyperflex hx data platformbefore 4.0\(2e\)
  • cisco hyperflex hx data platform4.5 and later · before 4.5\(2a\)

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 HyperFlex HX Data Platform

    • n/aaffected

Same product

cisco: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-1498Cisco HyperFlex HX Command Injection VulnerabilitiesKEV
    99Now
  • CVE-2021-1497Cisco HyperFlex HX Command Injection VulnerabilitiesKEV
    99Now
  • CVE-2019-1958Cisco HyperFlex Software Cross-Site Request Forgery Vulnerability
    35Monitor
  • CVE-2018-15380Cisco HyperFlex Software Command Injection Vulnerability
    35Monitor
  • CVE-2018-15382Cisco HyperFlex Software Static Signing Key Vulnerability
    34Monitor
  • CVE-2019-1664Cisco HyperFlex Software Unauthenticated Root Access Vulnerability
    31Monitor

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

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

  • Metasploit module ×1
  • Nuclei detection template ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Metasploit moduleexploit/linux/http/cisco_hyperflex_file_upload_rceCisco HyperFlex HX Data Platform unauthenticated file upload to RCE (CVE-2021-1499)exploit2021-05-05
Nuclei detection templateNuclei template CVE-2021-1499 —

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.

  1. Metasploit-1 d
  2. Published
  3. TodaySep 29, 2026+1973 d
EPSS, last 120 days

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 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).

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
low · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-306 · Missing Authentication for Critical Function

CVSS vector

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

nvd-primary

Root cause

A function added for development or support ships to production without authentication. It often relies on the assumption that it is “only reachable from the internal network.”

The bug in code

The whole CWE-306 class

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

Vulnerable

ts
// Added for the support teamapp.post("/maintenance/reset", resetDevice);

Fixed

ts
if (config.maintenanceEnabled) {  app.post(    "/maintenance/reset",    requireSession, requireRole("admin"), resetDevice  );}

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

—

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; 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 help

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