How severe is CVE-2025-20171?

CVE-2025-20171 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-20171 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-20171?

CVE-2025-20171 primarily affects Cisco Ios. In total, 1579 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-20171?

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.

Does CVE-2025-20171 have an EU (EUVD) identifier?

Yes. CVE-2025-20171 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-2163.

When was CVE-2025-20171 published?

CVE-2025-20171 was published on 2025-02-05 and last updated on 2026-06-17.

CVE-2025-20171

CVE-2025-20171 is a high-severity vulnerability in Cisco Ios with a CVSS 3.x base score of 7.7. 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-248.

Key facts

Severity: High (CVSS 3.x base score 7.7)
EPSS exploit prediction: 1% (51st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-2163
Weakness: CWE-248
Affected product: Cisco Ios
Published: 2025-02-05
Last modified: 2026-06-17

Description

A vulnerability in the SNMP subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to improper error handling when parsing SNMP requests. An attacker could exploit this vulnerability by sending a crafted SNMP request to an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly, resulting in a DoS condition.  This vulnerability affects SNMP versions 1, 2c, and 3. To exploit this vulnerability through SNMP v2c or earlier, the attacker must know a valid read-write or read-only SNMP community string for the affected system. To exploit this vulnerability through SNMP v3, the attacker must have valid SNMP user credentials for the affected system.

Frequently asked questions

What is CVE-2025-20171?: A vulnerability in the SNMP subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to improper error handling when parsing SNMP requests. An attacker could exploit this vulnerability by sending a crafted SNMP request to an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly, resulting in a DoS condition.  This vulnerability affects SNMP versions 1, 2c, and 3. To exploit this vulnerability through SNMP v2c or earlier, the attacker must know a valid read-write or read-only SNMP community string for the affected system. To exploit this vulnerability through SNMP v3, the attacker must have valid SNMP user credentials for the affected system.
How severe is CVE-2025-20171?: CVE-2025-20171 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-20171 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-20171?: CVE-2025-20171 primarily affects Cisco Ios. In total, 1579 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-20171?: 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.
Does CVE-2025-20171 have an EU (EUVD) identifier?: Yes. CVE-2025-20171 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-2163.
When was CVE-2025-20171 published?: CVE-2025-20171 was published on 2025-02-05 and last updated on 2026-06-17.

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snmp-dos-sdxnSUcW

Affected products (1579)

cpe:2.3:o:cisco:ios:12.2\(33\)cx:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)cy:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)cy1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)cy2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)ira:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)irb:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)irc:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)ird:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)ire:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)ire1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)ire2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)irf:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)irg:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)irg1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)irh:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)irh1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)mra:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)mrb:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)mrb1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)mrb2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)mrb3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)mrb4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)mrb5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)mrb6:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sb:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sb1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sb2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sb3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sb4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sb5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sb6:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sb7:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sb8:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sb8a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sb9:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sb10:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sb11:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sb12:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sb13:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sb14:*:*:*:*:*:*:*

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