Free and open · new CVEs checked every 20 minutesStatusRSSOpen dataContact

CVE-2017-11420: Stack-based buffer overflow in ASUS_Discovery.c in networkmap in Asuswrt-Merlin firmware for ASUS devices and

68
This week
CRITICAL 9.8REMOTEUPGRADEUPGRADEUPGRADE

CVE-2017-11420 is a critical-severity flaw (CVSS 9.8) affecting rt-ac5300 firmware, rt ac1900p firmware, rt-ac68u firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Stack-based buffer overflow in ASUS_Discovery.c in networkmap in Asuswrt-Merlin firmware for ASUS devices and ASUS firmware for ASUS RT-AC5300, RT_AC1900P, RT-AC68U, RT-AC68P, RT-AC88U, RT-AC66U, RT-AC66U_B1, RT-AC58U, RT-AC56U, RT-AC55U, RT-AC52U, RT-AC51U, RT-N18U, RT-N66U, RT-N56U, RT-AC3200, RT-AC3100, RT_AC1200GU, RT_AC1200G, RT-AC1200, RT-AC53, RT-N12HP, RT-N12HP_B1, RT-N12D1, RT-N12+, RT_N12+_PRO, RT-N16, and RT-N300 devices allows remote

Why this priority

  • Critical severity
  • EPSS top 7%: 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 score9.8 (Critical)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance5.6% (top 7%)
CISA exploited listNo
WeaknessCWE-119
Published2017-07-18
Last modified2026-06-17
Publisher (CNA): MITRE · Vendor: asuswrt-merlin project

Share: LinkedIn · X · Reddit

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

Am I affected?

Timeline

asuswrt-merlin project rt-ac5300 firmware UPGRADE
Affected: <= 3.0.0.4.380.7743
Fixed in: newer than 3.0.0.4.380.7743
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.
asuswrt-merlin project rt ac1900p firmware UPGRADE
Affected: <= 3.0.0.4.380.7743
Fixed in: newer than 3.0.0.4.380.7743
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.
asuswrt-merlin project rt-ac68u firmware UPGRADE
Affected: <= 3.0.0.4.380.7743
Fixed in: newer than 3.0.0.4.380.7743
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.
asuswrt-merlin project rt-ac68p firmware UPGRADE
Affected: <= 3.0.0.4.380.7743
Fixed in: newer than 3.0.0.4.380.7743
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.
asuswrt-merlin project rt-ac88u firmware UPGRADE
Affected: <= 3.0.0.4.380.7743
Fixed in: newer than 3.0.0.4.380.7743
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.
asuswrt-merlin project rt-ac66u firmware UPGRADE
Affected: <= 3.0.0.4.380.7743
Fixed in: newer than 3.0.0.4.380.7743
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-2017-11420?

rt-ac5300 firmware: upgrade to newer than 3.0.0.4.380.7743; rt ac1900p firmware: upgrade to newer than 3.0.0.4.380.7743; rt-ac68u firmware: upgrade to newer than 3.0.0.4.380.7743. Exact commands for each OS are on this page.

Is CVE-2017-11420 being exploited?

CVE-2017-11420 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-2017-11420 affect?

CVE-2017-11420 affects rt-ac5300 firmware, rt ac1900p firmware, rt-ac68u firmware. Severity is critical (CVSS 9.8). Stack-based buffer overflow in ASUS_Discovery.c in networkmap in Asuswrt-Merlin firmware for ASUS devices and ASUS firmware for ASUS RT-AC5300, RT_AC1900P, RT-AC68U, RT-AC68P, RT-AC88U, RT-AC66U, RT-AC66U_B1, RT-AC58U, RT-AC56U, RT-AC55U, R

How urgent is CVE-2017-11420?

Priority 68/100. Critical severity; EPSS top 7%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

References

← Back to latest CVEs

Get the weekly exploited-CVE digest by emailThe CVEs being attacked this week and how to fix them. No spam, unsubscribe any time.