CVE-2020-3222 [Medium] | Security Bypass in Ios Xe

A vulnerability in the web-based user interface (web UI) of Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to bypass access control restrictions on an affected device. The vulnerability is due to the presence of a proxy service at a specific endpoint of the web UI. An attacker could exploit this vulnerability by connecting to the proxy service. An exploit could allow the attacker to bypass access restrictions on the network by proxying their access request through the management network of the affected device. As the proxy is reached over the management virtual routing and forwarding (VRF), this could reduce the effectiveness of the bypass.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2023-03-07	0.89%	0.06%	-0.83%
2	2022-04-01	1.40%	0.89%	-0.52%
3	2022-02-04	—	1.40%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2023-03-07

0.89%

0.06%

-0.83%

2022-04-01

1.40%

0.89%

-0.52%

2022-02-04

—

1.40%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
4.3	3.1	MEDIUM	`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N` Click to expand Attack vector (AV:A) Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet. 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:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:L) Attackers could change some data, but it’s limited—not everything goes. Availability (A:N) Service keeps running; no real outage angle.	2.8	1.4	[email protected]
4.3	3.0	MEDIUM	`CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N` Click to expand Attack vector (AV:A) Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet. 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:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:L) Attackers could change some data, but it’s limited—not everything goes. Availability (A:N) Service keeps running; no real outage angle.	2.8	1.4	[email protected]
3.3	2.0	LOW	`AV:A/AC:L/Au:N/C:N/I:P/A:N` Click to expand Access vector (AV:A) Requires access to an adjacent network segment. Access complexity (AC:L) Exploitation conditions are straightforward and predictable. Authentication (AU:N) No authentication is required. Confidentiality impact (C:N) No confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:N) No availability impact.	6.5	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

4.3

3.1

MEDIUM

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

Attack vector (AV:A): Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
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:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:L): Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N): Service keeps running; no real outage angle.

2.8

1.4

[email protected]

4.3

3.0

MEDIUM

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

Attack vector (AV:A): Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
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:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:L): Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N): Service keeps running; no real outage angle.

2.8

1.4

[email protected]

3.3

2.0

LOW

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

Access vector (AV:A): Requires access to an adjacent network segment.
Access complexity (AC:L): Exploitation conditions are straightforward and predictable.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:N): No confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:N): No availability impact.

6.5

2.9

[email protected]

Affected software / configurations for CVE-2020-3222

Vendor	Product	Version	Raw CPE
cisco	ios_xe	16.10.1	cpe:2.3:o:cisco:ios_xe:16.10.1:::::::*
cisco	ios_xe	16.10.1a	cpe:2.3:o:cisco:ios_xe:16.10.1a:::::::*
cisco	ios_xe	16.10.1b	cpe:2.3:o:cisco:ios_xe:16.10.1b:::::::*
cisco	ios_xe	16.10.1c	cpe:2.3:o:cisco:ios_xe:16.10.1c:::::::*
cisco	ios_xe	16.10.1d	cpe:2.3:o:cisco:ios_xe:16.10.1d:::::::*
cisco	ios_xe	16.10.1e	cpe:2.3:o:cisco:ios_xe:16.10.1e:::::::*
cisco	ios_xe	16.10.1f	cpe:2.3:o:cisco:ios_xe:16.10.1f:::::::*
cisco	ios_xe	16.10.1g	cpe:2.3:o:cisco:ios_xe:16.10.1g:::::::*
cisco	ios_xe	16.10.1s	cpe:2.3:o:cisco:ios_xe:16.10.1s:::::::*
cisco	ios_xe	16.10.2	cpe:2.3:o:cisco:ios_xe:16.10.2:::::::*
cisco	ios_xe	16.11.1	cpe:2.3:o:cisco:ios_xe:16.11.1:::::::*
cisco	ios_xe	16.11.1a	cpe:2.3:o:cisco:ios_xe:16.11.1a:::::::*
cisco	ios_xe	16.11.1b	cpe:2.3:o:cisco:ios_xe:16.11.1b:::::::*
cisco	ios_xe	16.11.1c	cpe:2.3:o:cisco:ios_xe:16.11.1c:::::::*
cisco	ios_xe	16.11.1s	cpe:2.3:o:cisco:ios_xe:16.11.1s:::::::*
cisco	ios_xe	16.12.1	cpe:2.3:o:cisco:ios_xe:16.12.1:::::::*
cisco	ios_xe	16.12.1a	cpe:2.3:o:cisco:ios_xe:16.12.1a:::::::*
cisco	ios_xe	16.12.1c	cpe:2.3:o:cisco:ios_xe:16.12.1c:::::::*
cisco	ios_xe	16.12.1s	cpe:2.3:o:cisco:ios_xe:16.12.1s:::::::*
cisco	ios_xe	16.12.1t	cpe:2.3:o:cisco:ios_xe:16.12.1t:::::::*
cisco	ios_xe	16.12.1w	cpe:2.3:o:cisco:ios_xe:16.12.1w:::::::*
cisco	ios_xe	16.12.1y	cpe:2.3:o:cisco:ios_xe:16.12.1y:::::::*

References for CVE-2020-3222

URL	Tags
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webui-unauthprxy-KXXsbWh	Patch Vendor Advisory

URL

CVE-2020-3222 | Cisco IOS XE Software Web UI Unauthenticated Proxy Service Vulnerability

Exploit prediction scoring system (EPSS) score for CVE-2020-3222

Common vulnerability scoring system (CVSS) metrics for CVE-2020-3222

Weakness enumeration for CVE-2020-3222

Affected software / configurations for CVE-2020-3222

References for CVE-2020-3222