CVE-2018-12666: SV3C L-SERIES HD CAMERA V2.3.4.2103-S50-NTD-B20170508B devices improperly identifies users only by the authent

This week

CRITICAL 9.8REMOTEMITIGATE

CVE-2018-12666 is a critical-severity flaw (CVSS 9.8) affecting h.264 poe ip camera firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SV3C L-SERIES HD CAMERA V2.3.4.2103-S50-NTD-B20170508B devices improperly identifies users only by the authentication level sent in the cookies, which allow remote attackers to bypass authentication and gain administrator access by setting the authLevel cookie to 255.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.8% (top 21%)
CISA exploited list	No
Weakness	CWE-287
Published	2018-10-19
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: sv3c

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-10-19 22:29 UTCPublished CVE record published
2026-06-17 01:38 UTCUpdated Record last modified

sv3c h.264 poe ip camera firmware MITIGATE

Affected: v2.3.4.2103-s50-ntd-b20170508b · v2.3.4.2103-s50-ntd-b20170823b

Fixed in: no fixed release known

Safe to downgrade to: a release before v2.3.4.2103-s50-ntd-b20170508b

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2018-12666?

h.264 poe ip camera firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-12666 being exploited?

CVE-2018-12666 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2018-12666 affect?

CVE-2018-12666 affects h.264 poe ip camera firmware. Severity is critical (CVSS 9.8). SV3C L-SERIES HD CAMERA V2.3.4.2103-S50-NTD-B20170508B devices improperly identifies users only by the authentication level sent in the cookies, which allow remote attackers to bypass authentication and gain administrator access by setting

How urgent is CVE-2018-12666?

Priority 64/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2018-12675 MEDIUM 6.1 MITIGATE The SV3C HD Camera (L-SERIES V2.3.4.2103-S50-NTD-B20170508B and V2.3.4.2103-S50-NTD-B20170823B) does not perfo
CVE-2018-12674 MEDIUM 5.7 MITIGATE The SV3C HD Camera (L-SERIES V2.3.4.2103-S50-NTD-B20170508B and V2.3.4.2103-S50-NTD-B20170823B) stores the use
CVE-2018-12673 HIGH 7.5 MITIGATE An attacker with remote access to the SV3C HD Camera (L-SERIES V2.3.4.2103-S50-NTD-B20170508B and V2.3.4.2103-
CVE-2018-12672 MEDIUM 5.4 MITIGATE The SV3C HD Camera (L-SERIES V2.3.4.2103-S50-NTD-B20170508B) does not perform proper validation on user-suppli
CVE-2018-12671 CRITICAL 9.8 MITIGATE An attacker with remote access to the SV3C HD Camera (L-SERIES V2.3.4.2103-S50-NTD-B20170508B and V2.3.4.2103-

References

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