CVE-2021-1306 [Medium] | Security Vulnerability in Evolved Programmable Netw…

A vulnerability in the restricted shell of Cisco Evolved Programmable Network (EPN) Manager, Cisco Identity Services Engine (ISE), and Cisco Prime Infrastructure could allow an authenticated, local attacker to identify directories and write arbitrary files to the file system. This vulnerability is due to improper validation of parameters that are sent to a CLI command within the restricted shell. An attacker could exploit this vulnerability by logging in to the device and issuing certain CLI commands. A successful exploit could allow the attacker to identify file directories on the affected device and write arbitrary files to the file system on the affected device. To exploit this vulnerability, the attacker must be an authenticated shell user.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2023-03-07	0.89%	0.04%	-0.84%
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%

0.04%

-0.84%

2022-04-01

1.40%

0.89%

-0.52%

2022-02-04

—

1.40%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
4.4	3.1	MEDIUM	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. 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:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:L) Some sensitive info could get out, but not a total data dump. 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.	1.8	2.5	[email protected]
3.4	3.1	LOW	`CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. 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:H) They need powerful rights—admin, root, or similar—before this pays off. 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:L) Some sensitive info could get out, but not a total data dump. 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.	0.8	2.5	[email protected]
3.6	2.0	LOW	`AV:L/AC:L/Au:N/C:P/I:P/A:N` Click to expand Access vector (AV:L) Requires local access to the target system. Access complexity (AC:L) Exploitation conditions are straightforward and predictable. Authentication (AU:N) No authentication is required. Confidentiality impact (C:P) Partial confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:N) No availability impact.	3.9	4.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

4.4

3.1

MEDIUM

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

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
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:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L): Some sensitive info could get out, but not a total data dump.
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.

1.8

2.5

[email protected]

3.4

3.1

LOW

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

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
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:H): They need powerful rights—admin, root, or similar—before this pays off.
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:L): Some sensitive info could get out, but not a total data dump.
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.

0.8

2.5

[email protected]

3.6

2.0

LOW

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

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

3.9

4.9

[email protected]

Affected software / configurations for CVE-2021-1306

Vendor	Product	Version	Raw CPE
cisco	evolved_programmable_network_manager	< 5.0.1	cpe:2.3:a:cisco:evolved_programmable_network_manager::::::::
cisco	identity_services_engine	< 2.7.0	cpe:2.3:a:cisco:identity_services_engine::::::::
cisco	identity_services_engine	2.7.0	cpe:2.3:a:cisco:identity_services_engine:2.7.0:-::::::
cisco	identity_services_engine	2.7.0	cpe:2.3:a:cisco:identity_services_engine:2.7.0:patch2::::::
cisco	identity_services_engine	3.0.0	cpe:2.3:a:cisco:identity_services_engine:3.0.0:-::::::
cisco	identity_services_engine	3.0.0	cpe:2.3:a:cisco:identity_services_engine:3.0.0:patch1::::::
cisco	prime_infrastructure	< 3.8.1	cpe:2.3:a:cisco:prime_infrastructure::::::::
cisco	prime_infrastructure	3.8.1	cpe:2.3:a:cisco:prime_infrastructure:3.8.1:-::::::

References for CVE-2021-1306

URL	Tags
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ade-xcvAQEOZ	Vendor Advisory

URL

CVE-2021-1306 | Cisco ADE-OS Local File Inclusion Vulnerability

Exploit prediction scoring system (EPSS) score for CVE-2021-1306

Common vulnerability scoring system (CVSS) metrics for CVE-2021-1306

Weakness enumeration for CVE-2021-1306

Affected software / configurations for CVE-2021-1306

References for CVE-2021-1306