CVE-2025-15542: Improper handling of exceptional conditions in VX800v v1.0 in SIP processing allows an attacker to flood the d

Q: How do I fix CVE-2025-15542?

vx800v firmware: upgrade to 800.0.12. Exact commands for each OS are on this page.

Q: Is CVE-2025-15542 being exploited?

CVE-2025-15542 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-2025-15542 affect?

CVE-2025-15542 affects vx800v firmware. Severity is medium (CVSS 5.3). Improper handling of exceptional conditions in VX800v v1.0 in SIP processing allows an attacker to flood the device with crafted INVITE messages, blocking all voice lines and causing a denial of service on incoming calls.

Q: How urgent is CVE-2025-15542?

Priority 29/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2025-15542 is a medium-severity flaw (CVSS 5.3) affecting vx800v firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper handling of exceptional conditions in VX800v v1.0 in SIP processing allows an attacker to flood the device with crafted INVITE messages, blocking all voice lines and causing a denial of service on incoming calls.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 78%)
CISA exploited list	No
Weakness	CWE-754
Published	2026-01-29
Last modified	2026-06-17

Publisher (CNA): TPLink · Vendor: tp-link

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

Am I affected?

Timeline

2026-01-29 19:16 UTCPublished CVE record published
2026-06-17 08:37 UTCUpdated Record last modified

tp-link vx800v firmware UPGRADE

Affected: < 800.0.12

Fixed in: 800.0.12

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.

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-2025-15542?

vx800v firmware: upgrade to 800.0.12. Exact commands for each OS are on this page.

Is CVE-2025-15542 being exploited?

CVE-2025-15542 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-2025-15542 affect?

CVE-2025-15542 affects vx800v firmware. Severity is medium (CVSS 5.3). Improper handling of exceptional conditions in VX800v v1.0 in SIP processing allows an attacker to flood the device with crafted INVITE messages, blocking all voice lines and causing a denial of service on incoming calls.

How urgent is CVE-2025-15542?

Priority 29/100. Remotely exploitable, no login, no user action

Software pages

TP-Link vulnerabilities

Related CVEs

CVE-2025-15548 MEDIUM 6.5 UPGRADE Some VX800v v1.0 web interface endpoints transmit sensitive information over unencrypted HTTP due to missing a
CVE-2025-15543 MEDIUM 4.6 UPGRADE Improper link resolution in USB HTTP access path in VX800v v1.0 allows a crafted USB device to expose root fil
CVE-2025-15541 MEDIUM 6.3 UPGRADE Improper link resolution in the VX800v v1.0 SFTP service allows authenticated adjacent attackers to use crafte
CVE-2025-13399 HIGH 8.8 UPGRADE A weakness in the web interface’s application layer encryption in VX800v v1.0 allows an adjacent attacker to b

References

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