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NVD / CVE Program· CNA dahua

CVE-2021-33045: The identity authentication bypass vulnerability found in some Dahua products during the login process.

Noroxi assessment

Priority: Now (action score 99/100)

  • CISA has confirmed exploitation in the wild (Aug 21, 2024). Remediation deadline for US federal agencies: Sep 11, 2024.
  • A ready-made attack module is public (Nuclei); exploiting it takes no special expertise.
  • Probability of exploitation in the next 30 days: 99.5% (FIRST EPSS); higher than 99.9% of all records.
  • 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.

Patch today or shut off access. Until a fix is released, restrict access to the affected component and 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 · CISA KEV · FIRST EPSS

The identity authentication bypass vulnerability found in some Dahua products during the login process. Attackers can bypass device identity authentication by constructing malicious data packets.

CriticalCVSS 9.8 · v3.1KEVWeaponized No fix recorded
Published
Sep 15, 2021
Updated
Jun 16, 2026
EPSS
99.5% · 99th percentile

Report tools

JSON

Action score

99

Now

Patch today or shut off access.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
30 / 30 · Listed
EPSS
30 / 30 · 99.5%

CISA SSVC decision

Exploitation
active
Automatable
yes
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Aug 21, 2024. That signals real attacks, not theory.

Remediation deadline for US federal agencies: Sep 11, 2024.

Get told when this record changes

  • In CISA KEV: exploitation in the wild confirmed
  • Weaponized exploit exists
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2021-33045

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
dahuasecurityipc-hum7xxx firmware
dahuasecurityipc-hum7xxx
dahuasecurityipc-hx3xxx firmware
dahuasecurityipc-hx3xxx
dahuasecurityipc-hx5xxx firmware
dahuasecurityipc-hx5xxx
dahuasecuritynvr-1xxx firmware
dahuasecuritynvr-1xxx
dahuasecuritynvr-2xxx firmware
dahuasecuritynvr-2xxx
dahuasecuritynvr-4xxx firmware
dahuasecuritynvr-4xxx

and 24 more

Affected versions

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

  • dahuasecurity ipc-hum7xxx firmwarebefore 2.820.0000000.5.r.210705
  • dahuasecurity ipc-hx3xxx firmwarebefore 2.800.0000000.29.r.210630
  • dahuasecurity ipc-hx5xxx firmwarebefore 2.820.0000000.5.r.210705
  • dahuasecurity nvr-1xxx firmwarebefore 4.001.0000005.1.r.210709
  • dahuasecurity nvr-2xxx firmwarebefore 4.001.0000000.1.r.210710
  • dahuasecurity nvr-4xxx firmwarebefore 4.001.0000005.1.r.210713
  • dahuasecurity nvr-5xxx firmwarebefore 4.001.0000000.0.r.210710
  • dahuasecurity nvr-6xx firmwarebefore 4.001.0000001.1.r.210716
  • dahuasecurity vth-542xh firmwarebefore 4.500.0000002.0.r.210715
  • dahuasecurity vto-65xxx firmwarebefore 4.300.0000004.0.r.210715
  • dahuasecurity vto-75x95x firmwarebefore 4.300.0000003.0.r.210714
  • dahuasecurity xvr-4x04 firmwareall versions
  • dahuasecurity xvr-4x04 firmwarebefore 4.001.0000001.1.r.210709
  • dahuasecurity xvr-4x08 firmwarebefore 4.001.0000001.1.r.210709
  • dahuasecurity xvr-5x04 firmwarebefore 4.001.0000003.1.r.210710
  • dahuasecurity xvr-5x08 firmwarebefore 4.001.0000003.1.r.210710
  • dahuasecurity xvr-5x16 firmwarebefore 4.001.0000003.1.r.210710
  • dahuasecurity xvr-7x16 firmwarebefore 4.001.0000003.1.r.210710
  • dahuasecurity xvr-7x32 firmwarebefore 4.001.0000003.1.r.210710

Versions reported by the vendor

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

  • n/a Some Dahua IP Camera, Video Intercom, NVR, XVR devices

    • Dahua IP Camera devices IPC-HX3XXX, IPC-HX5XXX, and IPC-HUM7XXX Buildtime before May, 2020, Video Intercom devices VTO75X95X, VTO65XXX, and VTH542XH, NVR devices NVR1XXX, NVR2XXX, NVR5XXX, and NVR6XX,affected

Same product

dahuasecurity: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-33044The identity authentication bypass vulnerability found in some Dahua products during the login process.KEV
    99Now

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

  • Nuclei detection template ×1
  • Proof-of-concept repository on GitHub ×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-2021-33045 —
Proof-of-concept repository on GitHubstars:92021-10-11

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. Published
  2. First PoC+25 d
  3. CISA KEV+1070 d
  4. TodayOct 31, 2026+1872 d

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).

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
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-287 · Improper Authentication

CVSS vector

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

nvd-primary

Root cause

Authentication is added route by route instead of being enforced in one place. When a route added later bypasses the shared middleware, the session check never runs for it.

The bug in code

The whole CWE-287 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("/admin", requireSession, adminRouter);
// Route added later skips the middlewareapp.post("/admin-api/config", updateConfig);

Fixed

ts
const admin = express.Router();admin.use(requireSession, requireRole("admin"));
admin.post("/config", updateConfig);app.use("/admin", admin);

Attack context

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

Change log

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

References

Show all references (1 more)

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

All records