Exploitation evidence
Known exploited · CISA KEV listed
Added 2024-08-21. Ransomware campaign use: Unknown.
CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CISA due date: 2024-09-11. This is the catalog’s deadline, not an assessment of your organization’s exposure.
KEV checked 13 Nov 2026, 00:20 Jerusalem · Original catalog ↗Reported products and versions
n/a / Some Dahua IP Camera, Video Intercom, NVR, XVR devices
Default status: Not specified
- affected: 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, XVR devices XVR4xxx, XVR5xxx, and XVR7xxx Buildtime before December, 2019.
Fixes and workarounds
No explicit solution text in the downloaded CVE record. Consult the vendor advisory; unaffected version ranges are shown above as reported, not inferred as a patch recommendation.
Sources and related reporting
Observed change timeline
History begins when Egret first downloads each source. It is not the complete upstream CVE history.
12 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-12",
"epss": 0.99593,
"percentile": 0.99947
}10 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-10",
"epss": 0.99593,
"percentile": 0.99947
}09 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-09",
"epss": 0.99593,
"percentile": 0.99947
}08 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-08",
"epss": 0.99593,
"percentile": 0.99947
}07 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-07",
"epss": 0.99593,
"percentile": 0.99947
}06 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-06",
"epss": 0.99593,
"percentile": 0.99947
}06 Nov 2026, 06:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-05",
"epss": 0.99593,
"percentile": 0.99947
}05 Nov 2026, 12:20 Jerusalem · CVE Program record changed
Stored CNA snapshot at this observation.
{
"containers": {
"adp": [
{
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"dateUpdated": "2024-08-03T23:42:19.573Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
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"references": [
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://www.dahuasecurity.com/support/cybersecurity/details/957"
},
{
"name": "20211005 [Update]: Dahua Authentication bypass (CVE-2021-33044, CVE-2021-33045)",
"tags": [
"mailing-list",
"x_refsource_FULLDISC",
"x_transferred"
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"url": "http://seclists.org/fulldisclosure/2021/Oct/13"
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{
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"url": "http://packetstormsecurity.com/files/164423/Dahua-Authentication-Bypass.html"
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"title": "CVE Program Container"
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{
"metrics": [
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"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
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"reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-33045"
},
"type": "kev"
}
},
{
"other": {
"content": {
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"options": [
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},
{
"Automatable": "yes"
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{
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],
"role": "CISA Coordinator",
"timestamp": "2024-09-05T15:03:50.889187Z",
"version": "2.0.3"
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],
"problemTypes": [
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"description": "CWE-287 Improper Authentication",
"lang": "en",
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"providerMetadata": {
"dateUpdated": "2026-01-12T19:53:51.321Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"tags": [
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],
"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-33045"
}
],
"title": "CISA ADP Vulnrichment"
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],
"cna": {
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{
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"vendor": "n/a",
"versions": [
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}
]
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],
"descriptions": [
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"lang": "en",
"value": "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."
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},
{
"name": "20211005 [Update]: Dahua Authentication bypass (CVE-2021-33044, CVE-2021-33045)",
"tags": [
"mailing-list",
"x_refsource_FULLDISC"
],
"url": "http://seclists.org/fulldisclosure/2021/Oct/13"
},
{
"tags": [
"x_refsource_MISC"
],
"url": "http://packetstormsecurity.com/files/164423/Dahua-Authentication-Bypass.html"
}
],
"x_legacyV4Record": {
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"ASSIGNER": "cybersecurity@dahuatech.com",
"ID": "CVE-2021-33045",
"STATE": "PUBLIC"
},
"affects": {
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"version": {
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"version_value": "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, XVR devices XVR4xxx, XVR5xxx, and XVR7xxx Buildtime before December, 2019."
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]
},
"problemtype": {
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{
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]
}
]
},
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{
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},
{
"name": "20211005 [Update]: Dahua Authentication bypass (CVE-2021-33044, CVE-2021-33045)",
"refsource": "FULLDISC",
"url": "http://seclists.org/fulldisclosure/2021/Oct/13"
},
{
"name": "http://packetstormsecurity.com/files/164423/Dahua-Authentication-Bypass.html",
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"url": "http://packetstormsecurity.com/files/164423/Dahua-Authentication-Bypass.html"
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},
"cveMetadata": {
"assignerOrgId": "79ee569e-7d1e-4364-98f0-3a18e2a739ad",
"assignerShortName": "dahua",
"cveId": "CVE-2021-33045",
"datePublished": "2021-09-15T21:50:08.000Z",
"dateReserved": "2021-05-17T00:00:00.000Z",
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"state": "PUBLISHED"
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}04 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-04",
"epss": 0.99593,
"percentile": 0.99947
}03 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-03",
"epss": 0.99593,
"percentile": 0.99947
}03 Nov 2026, 02:22 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-02",
"epss": 0.99593,
"percentile": 0.99947
}03 Nov 2026, 02:22 Jerusalem · CISA KEV status changed
Stored KEV snapshot at this observation.
{
"cveID": "CVE-2021-33045",
"cwes": [
"CWE-287"
],
"dateAdded": "2024-08-21",
"dueDate": "2024-09-11",
"forensicTriage": "No",
"knownRansomwareCampaignUse": "Unknown",
"notes": "https://www.dahuasecurity.com/aboutUs/trustedCenter/details/582; https://nvd.nist.gov/vuln/detail/CVE-2021-33045",
"product": "IP Camera Firmware",
"requiredAction": "Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.",
"shortDescription": "Dahua IP cameras and related products contain an authentication bypass vulnerability when the loopback device is specified by the client during authentication.",
"vendorProject": "Dahua",
"vulnerabilityName": "Dahua IP Camera Authentication Bypass Vulnerability"
}