CVE-2020-3232 [High] | Denial of Service in Ios Xe

A vulnerability in the Simple Network Management Protocol (SNMP) implementation in Cisco ASR 920 Series Aggregation Services Router model ASR920-12SZ-IM could allow an authenticated, remote attacker to cause the device to reload. The vulnerability is due to incorrect handling of data that is returned for Cisco Discovery Protocol queries to SNMP. An attacker could exploit this vulnerability by sending a request for Cisco Discovery Protocol information by using SNMP. An exploit could allow the attacker to cause the affected device to reload, resulting in a denial of service (DoS) condition.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2025-12-28	0.37%	0.33%	-0.04%
2	2025-12-27	0.33%	0.37%	+0.04%
3	2025-10-28	—	0.33%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2025-12-28

0.37%

0.33%

-0.04%

2025-12-27

0.33%

0.37%

+0.04%

2025-10-28

—

0.33%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.7	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	3.1	4.0	[email protected]
6.3	3.0	MEDIUM	`CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:H) Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	1.8	4.0	[email protected]
6.8	2.0	MEDIUM	`AV:N/AC:L/Au:S/C:N/I:N/A:C` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:L) Exploitation conditions are straightforward and predictable. Authentication (AU:S) A single authentication is required. Confidentiality impact (C:N) No confidentiality impact. Integrity impact (I:N) No integrity impact. Availability impact (A:C) Complete availability impact.	8.0	6.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.7

3.1

HIGH

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

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

3.1

4.0

[email protected]

6.3

3.0

MEDIUM

CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H): Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

1.8

4.0

[email protected]

6.8

2.0

MEDIUM

AV:N/AC:L/Au:S/C:N/I:N/A:C Click to expand

Access vector (AV:N): Can be exploited remotely over network reachability.
Access complexity (AC:L): Exploitation conditions are straightforward and predictable.
Authentication (AU:S): A single authentication is required.
Confidentiality impact (C:N): No confidentiality impact.
Integrity impact (I:N): No integrity impact.
Availability impact (A:C): Complete availability impact.

8.0

6.9

[email protected]

Affected software / configurations for CVE-2020-3232

Vendor	Product	Version	Raw CPE
cisco	ios_xe	3.16.0s	cpe:2.3:o:cisco:ios_xe:3.16.0s:::::::*
cisco	ios_xe	3.16.1as	cpe:2.3:o:cisco:ios_xe:3.16.1as:::::::*
cisco	ios_xe	3.16.2as	cpe:2.3:o:cisco:ios_xe:3.16.2as:::::::*
cisco	ios_xe	3.16.3as	cpe:2.3:o:cisco:ios_xe:3.16.3as:::::::*
cisco	ios_xe	3.16.4bs	cpe:2.3:o:cisco:ios_xe:3.16.4bs:::::::*
cisco	ios_xe	3.16.4s	cpe:2.3:o:cisco:ios_xe:3.16.4s:::::::*
cisco	ios_xe	3.16.5as	cpe:2.3:o:cisco:ios_xe:3.16.5as:::::::*
cisco	ios_xe	3.16.5s	cpe:2.3:o:cisco:ios_xe:3.16.5s:::::::*
cisco	ios_xe	3.16.6bs	cpe:2.3:o:cisco:ios_xe:3.16.6bs:::::::*
cisco	ios_xe	3.16.6s	cpe:2.3:o:cisco:ios_xe:3.16.6s:::::::*
cisco	ios_xe	3.16.7bs	cpe:2.3:o:cisco:ios_xe:3.16.7bs:::::::*
cisco	ios_xe	3.16.7s	cpe:2.3:o:cisco:ios_xe:3.16.7s:::::::*
cisco	ios_xe	3.16.8s	cpe:2.3:o:cisco:ios_xe:3.16.8s:::::::*
cisco	ios_xe	3.16.9s	cpe:2.3:o:cisco:ios_xe:3.16.9s:::::::*
cisco	ios_xe	3.16.10s	cpe:2.3:o:cisco:ios_xe:3.16.10s:::::::*
cisco	ios_xe	3.17.0s	cpe:2.3:o:cisco:ios_xe:3.17.0s:::::::*
cisco	ios_xe	3.17.1s	cpe:2.3:o:cisco:ios_xe:3.17.1s:::::::*
cisco	ios_xe	3.17.2s	cpe:2.3:o:cisco:ios_xe:3.17.2s:::::::*
cisco	ios_xe	3.17.3s	cpe:2.3:o:cisco:ios_xe:3.17.3s:::::::*
cisco	ios_xe	3.17.4s	cpe:2.3:o:cisco:ios_xe:3.17.4s:::::::*
cisco	ios_xe	3.18.0s	cpe:2.3:o:cisco:ios_xe:3.18.0s:::::::*
cisco	ios_xe	3.18.0sp	cpe:2.3:o:cisco:ios_xe:3.18.0sp:::::::*
cisco	ios_xe	3.18.1gsp	cpe:2.3:o:cisco:ios_xe:3.18.1gsp:::::::*
cisco	ios_xe	3.18.1hsp	cpe:2.3:o:cisco:ios_xe:3.18.1hsp:::::::*
cisco	ios_xe	3.18.1isp	cpe:2.3:o:cisco:ios_xe:3.18.1isp:::::::*
cisco	ios_xe	3.18.1s	cpe:2.3:o:cisco:ios_xe:3.18.1s:::::::*
cisco	ios_xe	3.18.1sp	cpe:2.3:o:cisco:ios_xe:3.18.1sp:::::::*
cisco	ios_xe	3.18.2s	cpe:2.3:o:cisco:ios_xe:3.18.2s:::::::*
cisco	ios_xe	3.18.2sp	cpe:2.3:o:cisco:ios_xe:3.18.2sp:::::::*
cisco	ios_xe	3.18.3s	cpe:2.3:o:cisco:ios_xe:3.18.3s:::::::*
cisco	ios_xe	3.18.3sp	cpe:2.3:o:cisco:ios_xe:3.18.3sp:::::::*
cisco	ios_xe	3.18.4s	cpe:2.3:o:cisco:ios_xe:3.18.4s:::::::*
cisco	ios_xe	3.18.4sp	cpe:2.3:o:cisco:ios_xe:3.18.4sp:::::::*
cisco	ios_xe	16.3.10	cpe:2.3:o:cisco:ios_xe:16.3.10:::::::*
cisco	ios_xe	16.5.1	cpe:2.3:o:cisco:ios_xe:16.5.1:::::::*
cisco	ios_xe	16.5.2	cpe:2.3:o:cisco:ios_xe:16.5.2:::::::*
cisco	ios_xe	16.5.3	cpe:2.3:o:cisco:ios_xe:16.5.3:::::::*
cisco	ios_xe	16.6.1	cpe:2.3:o:cisco:ios_xe:16.6.1:::::::*
cisco	ios_xe	16.6.2	cpe:2.3:o:cisco:ios_xe:16.6.2:::::::*
cisco	ios_xe	16.6.3	cpe:2.3:o:cisco:ios_xe:16.6.3:::::::*
cisco	ios_xe	16.6.4	cpe:2.3:o:cisco:ios_xe:16.6.4:::::::*
cisco	ios_xe	16.7.1	cpe:2.3:o:cisco:ios_xe:16.7.1:::::::*
cisco	ios_xe	16.7.2	cpe:2.3:o:cisco:ios_xe:16.7.2:::::::*
cisco	ios_xe	16.7.3	cpe:2.3:o:cisco:ios_xe:16.7.3:::::::*
cisco	ios_xe	16.8.1	cpe:2.3:o:cisco:ios_xe:16.8.1:::::::*
cisco	ios_xe	16.8.1a	cpe:2.3:o:cisco:ios_xe:16.8.1a:::::::*
cisco	ios_xe	16.8.1b	cpe:2.3:o:cisco:ios_xe:16.8.1b:::::::*
cisco	ios_xe	16.8.1c	cpe:2.3:o:cisco:ios_xe:16.8.1c:::::::*
cisco	ios_xe	16.8.1d	cpe:2.3:o:cisco:ios_xe:16.8.1d:::::::*
cisco	ios_xe	16.8.1e	cpe:2.3:o:cisco:ios_xe:16.8.1e:::::::*
cisco	ios_xe	16.8.1s	cpe:2.3:o:cisco:ios_xe:16.8.1s:::::::*
cisco	ios_xe	16.9.1	cpe:2.3:o:cisco:ios_xe:16.9.1:::::::*
cisco	ios_xe	16.9.1a	cpe:2.3:o:cisco:ios_xe:16.9.1a:::::::*
cisco	ios_xe	16.9.1b	cpe:2.3:o:cisco:ios_xe:16.9.1b:::::::*
cisco	ios_xe	16.9.1c	cpe:2.3:o:cisco:ios_xe:16.9.1c:::::::*
cisco	ios_xe	16.9.1d	cpe:2.3:o:cisco:ios_xe:16.9.1d:::::::*
cisco	ios_xe	16.9.1s	cpe:2.3:o:cisco:ios_xe:16.9.1s:::::::*

References for CVE-2020-3232

URL	Tags
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asr920-ABjcLmef	Patch Vendor Advisory

URL

CVE-2020-3232 | Cisco ASR 920 Series Aggregation Services Router Model 12SZ-IM SNMP Denial of Service Vulnerability

Exploit prediction scoring system (EPSS) score for CVE-2020-3232

Common vulnerability scoring system (CVSS) metrics for CVE-2020-3232

Weakness enumeration for CVE-2020-3232

Affected software / configurations for CVE-2020-3232

References for CVE-2020-3232