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CVE-2018-18320· NVD / CVE Program· CNA mitre

An issue was discovered in the Merlin.PHP component 0.6.6 for Asuswrt-Merlin devices.

An issue was discovered in the Merlin.PHP component 0.6.6 for Asuswrt-Merlin devices. An attacker can execute arbitrary commands because exec.php has a popen call. NOTE: the vendor indicates that Merlin.PHP is designed only for use on a trusted intranet network, and intentionally allows remote code execution

CriticalCVSS 9.8 · v3.0—No exploit No fix recorded
Published
Oct 15, 2018
Updated
Jun 16, 2026
EPSS
5.2% · 92th percentile
CWE
—
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Report tools

JSON

Action score

41

Plan

Add it to your regular patch cycle.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
2 / 30 · 5.2%

Affected systems

VendorProduct
asuswrt-merlin projectrt-ac5300 firmware
asuswrt-merlin projectrt-ac5300
asuswrt-merlin projectrt ac1900p firmware
asuswrt-merlin projectrt ac1900p
asuswrt-merlin projectrt-ac68u firmware
asuswrt-merlin projectrt-ac68u
asuswrt-merlin projectrt-ac68p firmware
asuswrt-merlin projectrt-ac68p
asuswrt-merlin projectrt-ac88u firmware
asuswrt-merlin projectrt-ac88u
asuswrt-merlin projectrt-ac66u b1 firmware
asuswrt-merlin projectrt-ac66u b1

and 16 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • asuswrt-merlin project rt ac1900p firmwareup to 380.70 inclusive
  • asuswrt-merlin project rt-ac1900 firmwareup to 380.70 inclusive
  • asuswrt-merlin project rt-ac2900 firmwareup to 380.70 inclusive
  • asuswrt-merlin project rt-ac3100 firmwareup to 380.70 inclusive
  • asuswrt-merlin project rt-ac3200 firmwareup to 380.70 inclusive
  • asuswrt-merlin project rt-ac5300 firmwareup to 380.70 inclusive
  • asuswrt-merlin project rt-ac56u firmwareup to 380.70 inclusive
  • asuswrt-merlin project rt-ac66u b1 firmwareup to 380.70 inclusive
  • asuswrt-merlin project rt-ac68p firmwareup to 380.70 inclusive
  • asuswrt-merlin project rt-ac68u firmwareup to 380.70 inclusive
  • asuswrt-merlin project rt-ac68uf firmwareup to 380.70 inclusive
  • asuswrt-merlin project rt-ac86u firmwareup to 380.70 inclusive
  • asuswrt-merlin project rt-ac87 firmwareup to 380.70 inclusive
  • asuswrt-merlin project rt-ac88u firmwareup to 380.70 inclusive

Same product

asuswrt-merlin project: all records

Other highest-scoring records for the same primary product.

  • CVE-2018-18319An issue was discovered in the Merlin.PHP component 0.6.6 for Asuswrt-Merlin devices.
    41Plan
  • CVE-2017-11420Stack-based buffer overflow in ASUS_Discovery.c in networkmap in Asuswrt-Merlin firmware for ASUS devices and ASUS firmware for ASUS RT-AC53
    41Plan
  • CVE-2017-11345Stack buffer overflow in networkmap in Asuswrt-Merlin firmware for ASUS devices and ASUS firmware for ASUS RT-AC5300, RT_AC1900P, RT-AC68U,
    32Monitor
  • CVE-2017-11344Global buffer overflow in networkmap in Asuswrt-Merlin firmware for ASUS devices and ASUS firmware for ASUS RT-AC5300, RT_AC1900P, RT-AC68U,
    32Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

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Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

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