Is CVE-2017-5491 in the CISA KEV catalog?

No. CVE-2017-5491 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-5491?

CVE-2017-5491 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2017-5491?

CVE-2017-5491 has an EPSS score of 3.22% (87th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-5491?

Upgrade wordpress on debian 11 to 4.7.1+dfsg-1 or later.

CVE & CISA-KEV Catalog

CVE-2017-5491

MEDIUMEPSS 87th pctl

5.3

CVSS v3

NVD

Description

wp-mail.php in WordPress before 4.7.1 might allow remote attackers to bypass intended posting restrictions via a spoofed mail server with the mail.example.com name.

CWE-1188

How to fix

Remediation Available

wordpressDebian

Fixed in:4.7.1+dfsg-1CVE-2017-5491

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

3.22%probability of exploitation in 30 days

87thpercentile

Elevated risk: more likely to be exploited than 87% of all known CVEs.

References

Patch1

github.com

Vendor Advisory2

Third-Party Advisory1

openwall.com

Other references4

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-13.