How severe is CVE-2025-20221?

CVE-2025-20221 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2025-20221 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-20221?

CVE-2025-20221 primarily affects Cisco Ios Xe. In total, 89 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-20221?

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

Does CVE-2025-20221 have an EU (EUVD) identifier?

Yes. CVE-2025-20221 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-13894.

When was CVE-2025-20221 published?

CVE-2025-20221 was published on 2025-05-07 and last updated on 2026-06-17.

CVE-2025-20221

CVE-2025-20221 is a medium-severity vulnerability in Cisco Ios Xe with a CVSS 3.x base score of 5.3. 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-200.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-13894
Weakness: CWE-200
Affected product: Cisco Ios Xe
Published: 2025-05-07
Last modified: 2026-06-17

Description

A vulnerability in the packet filtering features of Cisco IOS XE SD-WAN Software could allow an unauthenticated, remote attacker to bypass Layer 3 and Layer 4 traffic filters. This vulnerability is due to improper traffic filtering conditions on an affected device. An attacker could exploit this vulnerability by sending a crafted packet to the affected device. A successful exploit could allow the attacker to bypass the Layer 3 and Layer 4 traffic filters and inject a crafted packet into the network.

Frequently asked questions

What is CVE-2025-20221?: A vulnerability in the packet filtering features of Cisco IOS XE SD-WAN Software could allow an unauthenticated, remote attacker to bypass Layer 3 and Layer 4 traffic filters. This vulnerability is due to improper traffic filtering conditions on an affected device. An attacker could exploit this vulnerability by sending a crafted packet to the affected device. A successful exploit could allow the attacker to bypass the Layer 3 and Layer 4 traffic filters and inject a crafted packet into the network.
How severe is CVE-2025-20221?: CVE-2025-20221 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2025-20221 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-20221?: CVE-2025-20221 primarily affects Cisco Ios Xe. In total, 89 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-20221?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-20221 have an EU (EUVD) identifier?: Yes. CVE-2025-20221 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-13894.
When was CVE-2025-20221 published?: CVE-2025-20221 was published on 2025-05-07 and last updated on 2026-06-17.

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snmp-bypass-HHUVujdn

Affected products (89)

cpe:2.3:o:cisco:ios_xe:16.12.13:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.1.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.1.1s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.1.1t:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.1.3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.2.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.2.1a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.2.1r:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.2.1v:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.2.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.2.3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.3.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.3.1a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.3.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.3.2a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.3.3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.3.4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.3.4a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.3.5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.3.6:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.3.7:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.3.8:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.3.8a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.4.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.4.1a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.4.1b:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.4.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.5.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.5.1a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.6.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.6.1a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.6.1y:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.6.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.6.3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.6.3a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.6.4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.6.5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.6.5a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.6.6:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:17.6.6a:*:*:*:*:*:*:*

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