How severe is CVE-2025-20153?

CVE-2025-20153 has a CVSS 3.x base score of 5.8, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2025-20153 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-20153?

CVE-2025-20153 primarily affects Cisco Secure Email Gateway. In total, 15 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-20153?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-20153 have an EU (EUVD) identifier?

Yes. CVE-2025-20153 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-4671.

When was CVE-2025-20153 published?

CVE-2025-20153 was published on 2025-02-19 and last updated on 2026-06-17.

CVE-2025-20153

CVE-2025-20153 is a medium-severity vulnerability in Cisco Secure Email Gateway with a CVSS 3.x base score of 5.8. 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-284.

Key facts

Severity: Medium (CVSS 3.x base score 5.8)
EPSS exploit prediction: 0% (29th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-4671
Weakness: CWE-284
Affected product: Cisco Secure Email Gateway
Published: 2025-02-19
Last modified: 2026-06-17

Description

A vulnerability in the email filtering mechanism of Cisco Secure Email Gateway could allow an unauthenticated, remote attacker to bypass the configured rules and allow emails that should have been denied to flow through an affected device.   This vulnerability is due to improper handling of email that passes through an affected device. An attacker could exploit this vulnerability by sending a crafted email through the affected device. A successful exploit could allow the attacker to bypass email filters on the affected device.

Frequently asked questions

What is CVE-2025-20153?: A vulnerability in the email filtering mechanism of Cisco Secure Email Gateway could allow an unauthenticated, remote attacker to bypass the configured rules and allow emails that should have been denied to flow through an affected device.   This vulnerability is due to improper handling of email that passes through an affected device. An attacker could exploit this vulnerability by sending a crafted email through the affected device. A successful exploit could allow the attacker to bypass email filters on the affected device.
How severe is CVE-2025-20153?: CVE-2025-20153 has a CVSS 3.x base score of 5.8, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2025-20153 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-20153?: CVE-2025-20153 primarily affects Cisco Secure Email Gateway. In total, 15 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-20153?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-20153 have an EU (EUVD) identifier?: Yes. CVE-2025-20153 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-4671.
When was CVE-2025-20153 published?: CVE-2025-20153 was published on 2025-02-19 and last updated on 2026-06-17.

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-mailpol-bypass-5nVcJZMw

Affected products (15)

cpe:2.3:a:cisco:secure_email_gateway:13.0.0-392:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_email_gateway:13.0.5-007:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_email_gateway:13.5.1-277:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_email_gateway:13.5.4-038:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_email_gateway:14.0.0-698:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_email_gateway:14.2.0-620:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_email_gateway:14.2.1-020:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_email_gateway:14.3.0-032:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_email_gateway:15.0.0-104:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_email_gateway:15.0.1-030:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_email_gateway:15.0.3-002:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_email_gateway:15.5.0-048:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_email_gateway:15.5.1-055:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_email_gateway:15.5.2-018:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_email_gateway:16.0.0-050:*:*:*:*:*:*:*

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