How severe is CVE-2018-21116?

CVE-2018-21116 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-21116 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-21116?

CVE-2018-21116 affects Netgear Xr500 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-21116?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2018-21116 published?

CVE-2018-21116 was published on 2020-04-22 and last updated on 2026-06-17.

CVE-2018-21116

CVE-2018-21116 is a high-severity vulnerability in Netgear Xr500 Firmware with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 5.8
EPSS exploit prediction: 1% (59th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Netgear Xr500 Firmware
Published: 2020-04-22
Last modified: 2026-06-17

Description

NETGEAR XR500 devices before 2.3.2.32 are affected by remote code execution by unauthenticated attackers.

Frequently asked questions

What is CVE-2018-21116?: NETGEAR XR500 devices before 2.3.2.32 are affected by remote code execution by unauthenticated attackers.
How severe is CVE-2018-21116?: CVE-2018-21116 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-21116 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-21116?: CVE-2018-21116 affects Netgear Xr500 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-21116?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2018-21116 published?: CVE-2018-21116 was published on 2020-04-22 and last updated on 2026-06-17.

References

https://kb.netgear.com/000060242/Security-Advisory-for-Pre-Authentication-Stack-Overflow-on-XR500-PSV-2018-0312

Affected products (1)

cpe:2.3:o:netgear:xr500_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Netgear Xr500 Firmware

CVE-2021-38516 — Critical (CVSS 10.0): Certain NETGEAR devices are affected by lack of access control at the function level. This affects D6220 before…
CVE-2021-29068 — Critical (CVSS 9.9): Certain NETGEAR devices are affected by a buffer overflow by an authenticated user. This affects R6700v3 before…
CVE-2020-35795 — Critical (CVSS 9.8): Certain NETGEAR devices are affected by a buffer overflow by an unauthenticated attacker. This affects AC2100 before…
CVE-2021-45618 — Critical (CVSS 9.6): Certain NETGEAR devices are affected by command injection by an unauthenticated attacker. This affects D7800 before…
CVE-2020-35800 — Critical (CVSS 9.4): Certain NETGEAR devices are affected by incorrect configuration of security settings. This affects AC2100 before…
CVE-2021-34947 — High (CVSS 8.8): NETGEAR R7800 net-cgi Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows…

All CVEs affecting Netgear Xr500 Firmware →