CVE-2025-20352· NVD / CVE Program· CNA cisco

A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software and Cisco IOS XE Software could allow the f

A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software and Cisco IOS XE Software could allow the following: An authenticated, remote attacker with low privileges could cause a denial of service (DoS) condition on an affected device that is running Cisco IOS Software or Cisco IOS XE Software. To cause the DoS, the attacker must have the SNMPv2c or earlier read-only community string or valid SNMPv3 user credentials. An authenticated, remote attacker with high privileges could execute code as the root user on an affected device that is running Cisco IOS XE Software. To execute code as the root user, the attacker must have the SNMPv1 or v2c read-only community string or valid SNMPv3 user credentials and administrative or privilege 15 credentials on the affected device. An attacker could exploit this vulnerability by sending a crafted SNMP packet to an affected device over IPv4 or IPv6 networks. This vulnerability is due to a stack overflow condition in the SNMP subsystem of the affected software. A successful exploit could allow a low-privileged attacker to cause the affected system to reload, resulting in a DoS condition, or allow a high-privileged attacker to execute arbitrary code as the root user and obtain full control of the affected system. Note: This vulnerability affects all versions of SNMP.

HighCVSS 7.7 · v3.1KEVWeaponized No fix recorded

BDU:2025-12385

Published: Sep 24, 2025
Updated: Sep 25, 2026
EPSS: 39.4% · 99th percentile
CWE: CWE-121

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Action score

This week

Don’t wait for the next maintenance window.

CVSS: 30 / 40 · 7.7 / 10
CISA KEV: 30 / 30 · Listed
EPSS: 12 / 30 · 39.4%

CISA SSVC decision

Exploitation: active
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · cisco: 7.7; NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Sep 29, 2025. That signals real attacks, not theory.

Remediation deadline for government agencies: Oct 20, 2025.

Affected systems

Vendor	Product	CPE
cisco	ios xe sd-wan	cpe:2.3:o:cisco:ios_xe_sd-wan
cisco	ios xe	cpe:2.3:o:cisco:ios_xe
cisco	ios	cpe:2.3:o:cisco:ios

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

cisco ios12.2(33)sxi
cisco ios12.2(33)sxi1
cisco ios12.2(33)sxi10
cisco ios12.2(33)sxi11
cisco ios12.2(33)sxi12
cisco ios12.2(33)sxi13
cisco ios12.2(33)sxi14
cisco ios12.2(33)sxi2
cisco ios12.2(33)sxi2a
cisco ios12.2(33)sxi3
cisco ios12.2(33)sxi4
cisco ios12.2(33)sxi4a
cisco ios12.2(33)sxi5
cisco ios12.2(33)sxi6
cisco ios12.2(33)sxi7
cisco ios12.2(33)sxi8
cisco ios12.2(33)sxi8a
cisco ios12.2(33)sxi9
cisco ios12.2(33)sxj
cisco ios12.2(33)sxj1

Versions reported by the vendor

Affected version ranges reported by the assigning authority (cisco). Independent of NVD's CPE analysis and usually ahead of it.

Cisco Cisco IOS XE Catalyst SD-WAN
- 16.9.1, 16.9.2, 16.9.3, 16.9.4, 16.10.1, 16.10.2, 16.10.3, 16.10.3a, 16.10.3b, 16.10.4, 16.10.5, 16.10.6 … (+9)affected
Cisco Cisco IOS XE Software
- 3.5.0E, 3.5.1E, 3.5.2E, 3.5.3E, 3.6.0E, 3.6.1E, 3.6.2aE, 3.6.2E, 3.6.3E, 3.6.4E, 3.6.5E, 3.6.6E … (+28)affected
Cisco IOS
- 12.2(55)SE, 12.2(55)SE3, 12.2(55)SE2, 12.2(58)SE, 12.2(55)SE1, 12.2(58)SE1, 12.2(55)SE4, 12.2(58)SE2, 12.2(55)SE5, 12.2(55)SE6, 12.2(55)SE7, 12.2(55)SE8 … (+28)affected

Same product

cisco: all records

Other highest-scoring records for the same primary product.

CVE-2021-34727Cisco IOS XE SD-WAN Software Buffer Overflow Vulnerability
40Plan
CVE-2021-1301Cisco SD-WAN Buffer Overflow Vulnerabilities
40Plan
CVE-2021-1300Cisco SD-WAN Buffer Overflow Vulnerabilities
40Plan
CVE-2021-1274Cisco SD-WAN Denial of Service Vulnerabilities
35Monitor
CVE-2021-1279Cisco SD-WAN Denial of Service Vulnerabilities
34Monitor
CVE-2021-1273Cisco SD-WAN Denial of Service Vulnerabilities
34Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

Proof-of-concept repository on GitHub ×2

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
Source	Kind	Date
Proof-of-concept repository on GitHub	stars:7	2025-09-25
Proof-of-concept repository on GitHub	stars:0	2026-07-21

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

PublishedSep 24, 2025
First PoCSep 25, 2025same day
CISA KEVSep 29, 2025+4 d
TodaySep 29, 2026+370 d

EPSS, last 120 days+1% in 7 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
A low-privileged account is enough.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: none
Integrity: none
Availability: high · the service can be disrupted

Impact can extend beyond the vulnerable component (scope changes).

Attack vector: Network
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Changed
Confidentiality impact: None
Integrity impact: None
Availability impact: High

Weakness class (CWE)

CWE-121 · Stack-based Buffer Overflow

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

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Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records