How severe is CVE-2019-19840?

CVE-2019-19840 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-19840 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-19840?

CVE-2019-19840 primarily affects Ruckuswireless Unleashed. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-19840?

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

When was CVE-2019-19840 published?

CVE-2019-19840 was published on 2020-01-22 and last updated on 2026-06-17.

CVE-2019-19840

CVE-2019-19840 is a critical-severity vulnerability in Ruckuswireless Unleashed with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 4% (90th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Ruckuswireless Unleashed
Published: 2020-01-22
Last modified: 2026-06-17

Description

A stack-based buffer overflow in zap_parse_args in zap.c in zap in Ruckus Unleashed through 200.7.10.102.64 allows remote code execution via an unauthenticated HTTP request.

Frequently asked questions

What is CVE-2019-19840?: A stack-based buffer overflow in zap_parse_args in zap.c in zap in Ruckus Unleashed through 200.7.10.102.64 allows remote code execution via an unauthenticated HTTP request.
How severe is CVE-2019-19840?: CVE-2019-19840 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-19840 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-19840?: CVE-2019-19840 primarily affects Ruckuswireless Unleashed. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-19840?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2019-19840 published?: CVE-2019-19840 was published on 2020-01-22 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:o:ruckuswireless:unleashed:*:*:*:*:*:*:*:*
cpe:2.3:o:ruckuswireless:zonedirector_1200_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Ruckuswireless Unleashed

CVE-2019-19839 — Critical (CVSS 9.8): emfd in Ruckus Wireless Unleashed through 200.7.10.102.64 allows remote attackers to execute OS commands via a POST…
CVE-2019-19838 — Critical (CVSS 9.8): emfd in Ruckus Wireless Unleashed through 200.7.10.102.64 allows remote attackers to execute OS commands via a POST…
CVE-2019-19842 — Critical (CVSS 9.8): emfd in Ruckus Wireless Unleashed through 200.7.10.102.64 allows remote attackers to execute OS commands via a POST…
CVE-2019-19841 — Critical (CVSS 9.8): emfd in Ruckus Wireless Unleashed through 200.7.10.102.64 allows remote attackers to execute OS commands via a POST…
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CVE-2019-19836 — Critical (CVSS 9.8): AjaxRestrictedCmdStat in zap in Ruckus Wireless Unleashed through 200.7.10.102.64 allows remote code execution via a…

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