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CVE-2021-21745· NVD / CVE Program· CNA zte

ZTE MF971R product has a Referer authentication bypass vulnerability.

ZTE MF971R product has a Referer authentication bypass vulnerability. Without CSRF verification, an attackercould use this vulnerability to perform illegal authorization operations by sending a request to the user to click.

MediumCVSS 4.3 · v3.1—Proof of concept No fix recorded

Noroxi analysis

No Noroxi analysis for this record yet

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Published
Oct 20, 2021
Updated
Jun 16, 2026
EPSS
55.7% · 99th percentile
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Report tools

JSON

Action score

34

Monitor

Low priority for now.

CVSS
17 / 40 · 4.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
17 / 30 · 55.7%

Affected systems

VendorProduct
ztemf971r firmware
ztemf971r

Affected versions

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

  • zte mf971r firmware1v1.0.0b06
  • zte mf971r firmware2v1.0.0b03
  • zte mf971r firmwares2v1.0.0b03
  • zte mf971r firmwaresv1.0.0b05
  • zte mf971r firmwarev1.0.0b05

Versions reported by the vendor

Affected version ranges reported by the assigning authority (zte). Independent of NVD's CPE analysis and usually ahead of it.

  • n/a MF971R

    • BD_ZTE_MF971RV1.0.0B05, BD_PLKPLMF971R1V1.0.0B06, BD_MF971R2V1.0.0B03, BD_ZTE_MF971RS2V1.0.0B03, BD_ZTE_MF971RSV1.0.0B05affected

Same product

zte: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-21748ZTE MF971R product has two stack-based buffer overflow vulnerabilities.
    40Plan
  • CVE-2021-21749ZTE MF971R product has two stack-based buffer overflow vulnerabilities.
    39Monitor
  • CVE-2021-21744ZTE MF971R product has a configuration file control vulnerability.
    30Monitor
  • CVE-2021-21747ZTE MF971R product has reflective XSS vulnerability.
    24Monitor
  • CVE-2021-21746ZTE MF971R product has reflective XSS vulnerability.
    24Monitor
  • CVE-2021-21743ZTE MF971R product has a CRLF injection vulnerability.
    17Monitor

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

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • 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
Nuclei detection templateNuclei template CVE-2021-21745 —

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.

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.
  • A user must open a link or visit a page.
  • 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
Required
Scope
Unchanged
Confidentiality impact
None
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-352 · Cross-Site Request Forgery (CSRF)

CVSS vector

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

nvd-primary

Root cause

State-changing requests rely on the session cookie the browser sends automatically; nothing verifies that the request came from the user’s own page.

The bug in code

The whole CWE-352 class

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

Vulnerable

ts
app.use(session({ cookie: { httpOnly: true } }));app.post("/account/address", updateAddress);

Fixed

ts
app.use(session({ cookie: { httpOnly: true, sameSite: "lax" } }));app.post("/account/address", csrfProtection, updateAddress);

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