CVE-2021-35336: Tieline IP Audio Gateway 2.6.4.8 and below is affected by Incorrect Access Control

Q: How do I fix CVE-2021-35336?

ip audtio gateway firmware: upgrade to newer than 2.6.4.8. Exact commands for each OS are on this page.

Q: Is CVE-2021-35336 being exploited?

CVE-2021-35336 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-35336 affect?

CVE-2021-35336 affects ip audtio gateway firmware. Severity is critical (CVSS 9.8). Tieline IP Audio Gateway 2.6.4.8 and below is affected by Incorrect Access Control. A vulnerability in the Tieline Web Administrative Interface could allow an unauthenticated user to access a sensitive part of the system with a high privile

Q: How urgent is CVE-2021-35336?

Priority 68/100. Critical severity; EPSS top 4%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2021-35336 is a critical-severity flaw (CVSS 9.8) affecting ip audtio gateway firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Tieline IP Audio Gateway 2.6.4.8 and below is affected by Incorrect Access Control. A vulnerability in the Tieline Web Administrative Interface could allow an unauthenticated user to access a sensitive part of the system with a high privileged account.

Why this priority

Critical severity
EPSS top 4%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	10.1% (top 4%)
CISA exploited list	No
Weakness	CWE-1188
Published	2021-07-01
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: tieline

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

Am I affected?

Timeline

2021-07-01 13:15 UTCPublished CVE record published
2026-06-17 03:57 UTCUpdated Record last modified

tieline ip audtio gateway firmware UPGRADE

Affected: <= 2.6.4.8

Fixed in: newer than 2.6.4.8

Safe to downgrade to: no unaffected older release

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Nuclei scan template: Tieline IP Audio Gateway <=2.6.4.8 - Unauthorized Remote Admin Panel Access

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-2021-35336?

ip audtio gateway firmware: upgrade to newer than 2.6.4.8. Exact commands for each OS are on this page.

Is CVE-2021-35336 being exploited?

CVE-2021-35336 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-2021-35336 affect?

CVE-2021-35336 affects ip audtio gateway firmware. Severity is critical (CVSS 9.8). Tieline IP Audio Gateway 2.6.4.8 and below is affected by Incorrect Access Control. A vulnerability in the Tieline Web Administrative Interface could allow an unauthenticated user to access a sensitive part of the system with a high privile

How urgent is CVE-2021-35336?

Priority 68/100. Critical severity; EPSS top 4%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

References

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