How severe is CVE-2018-9843?

CVE-2018-9843 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-2018-9843 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 17% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-9843?

CVE-2018-9843 affects Cyberark Password Vault. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-9843?

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-2018-9843 published?

CVE-2018-9843 was published on 2018-04-12 and last updated on 2026-06-17.

CVE-2018-9843

CVE-2018-9843 is a critical-severity vulnerability in Cyberark Password Vault with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 17% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-502.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 17% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-502
Affected product: Cyberark Password Vault
Published: 2018-04-12
Last modified: 2026-06-17

Description

The REST API in CyberArk Password Vault Web Access before 9.9.5 and 10.x before 10.1 allows remote attackers to execute arbitrary code via a serialized .NET object in an Authorization HTTP header.

Frequently asked questions

What is CVE-2018-9843?: The REST API in CyberArk Password Vault Web Access before 9.9.5 and 10.x before 10.1 allows remote attackers to execute arbitrary code via a serialized .NET object in an Authorization HTTP header.
How severe is CVE-2018-9843?: CVE-2018-9843 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-2018-9843 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 17% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-9843?: CVE-2018-9843 affects Cyberark Password Vault. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-9843?: 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-2018-9843 published?: CVE-2018-9843 was published on 2018-04-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:cyberark:password_vault:*:*:*:*:*:*:*:*

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