How severe is CVE-2018-5549?

CVE-2018-5549 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2018-5549 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-5549?

CVE-2018-5549 primarily affects F5 Big-ip Access Policy Manager. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-5549?

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-2018-5549 published?

CVE-2018-5549 was published on 2018-09-13 and last updated on 2026-06-17.

CVE-2018-5549

CVE-2018-5549 is a high-severity vulnerability in F5 Big-ip Access Policy Manager with a CVSS 3.x base score of 7.5. 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-20.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: F5 Big-ip Access Policy Manager
Published: 2018-09-13
Last modified: 2026-06-17

Description

On BIG-IP APM 11.6.0-11.6.3.1, 12.1.0-12.1.3.3, 13.0.0, and 13.1.0-13.1.0.3, APMD may core when processing SAML Assertion or response containing certain elements.

Frequently asked questions

What is CVE-2018-5549?: On BIG-IP APM 11.6.0-11.6.3.1, 12.1.0-12.1.3.3, 13.0.0, and 13.1.0-13.1.0.3, APMD may core when processing SAML Assertion or response containing certain elements.
How severe is CVE-2018-5549?: CVE-2018-5549 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2018-5549 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-5549?: CVE-2018-5549 primarily affects F5 Big-ip Access Policy Manager. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-5549?: 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-2018-5549 published?: CVE-2018-5549 was published on 2018-09-13 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_access_policy_manager:13.0.0:*:*:*:*:*:*:*

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