CVE-2016-1291 [Critical] | Input Validation Bypass in Evolved Programmable Netw…

CVE-2016-1291 is rated High Risk (76.2/100): CVSS Critical severity, with high exploitation likelihood (EPSS 6.77%, 93th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +4.45% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	2.32%	6.77%	+4.45%
2	2025-07-13	2.69%	2.32%	-0.37%
3	2025-03-30	—	2.69%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

2.32%

6.77%

+4.45%

2025-07-13

2.69%

2.32%

-0.37%

2025-03-30

—

2.69%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
9.8	3.0	CRITICAL	`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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: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:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	3.9	5.9	[email protected]
9.3	2.0	HIGH	`AV:N/AC:M/Au:N/C:C/I:C/A:C` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:M) Exploitation needs some favorable conditions, but not exceptional ones. Authentication (AU:N) No authentication is required. Confidentiality impact (C:C) Complete confidentiality impact. Integrity impact (I:C) Complete integrity impact. Availability impact (A:C) Complete availability impact.	8.6	10.0	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

9.8

3.0

CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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: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:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

3.9

5.9

[email protected]

9.3

2.0

HIGH

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

Access vector (AV:N): Can be exploited remotely over network reachability.
Access complexity (AC:M): Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:C): Complete confidentiality impact.
Integrity impact (I:C): Complete integrity impact.
Availability impact (A:C): Complete availability impact.

8.6

10.0

[email protected]

Affected software / configurations for CVE-2016-1291

Vendor	Product	Version	Raw CPE
cisco	evolved_programmable_network_manager	1.2.0	cpe:2.3:a:cisco:evolved_programmable_network_manager:1.2.0:::::::*
cisco	prime_infrastructure	1.2	cpe:2.3:a:cisco:prime_infrastructure:1.2:::::::*
cisco	prime_infrastructure	1.2.0.103	cpe:2.3:a:cisco:prime_infrastructure:1.2.0.103:::::::*
cisco	prime_infrastructure	1.2.1	cpe:2.3:a:cisco:prime_infrastructure:1.2.1:::::::*
cisco	prime_infrastructure	1.3	cpe:2.3:a:cisco:prime_infrastructure:1.3:::::::*
cisco	prime_infrastructure	1.3.0.20	cpe:2.3:a:cisco:prime_infrastructure:1.3.0.20:::::::*
cisco	prime_infrastructure	1.4	cpe:2.3:a:cisco:prime_infrastructure:1.4:::::::*
cisco	prime_infrastructure	1.4.0.45	cpe:2.3:a:cisco:prime_infrastructure:1.4.0.45:::::::*
cisco	prime_infrastructure	1.4.1	cpe:2.3:a:cisco:prime_infrastructure:1.4.1:::::::*
cisco	prime_infrastructure	1.4.2	cpe:2.3:a:cisco:prime_infrastructure:1.4.2:::::::*
cisco	prime_infrastructure	2.0	cpe:2.3:a:cisco:prime_infrastructure:2.0:::::::*
cisco	prime_infrastructure	2.1.0	cpe:2.3:a:cisco:prime_infrastructure:2.1.0:::::::*
cisco	prime_infrastructure	2.2	cpe:2.3:a:cisco:prime_infrastructure:2.2:::::::*
sun	opensolaris	snv_124	cpe:2.3:o:sun:opensolaris:snv_124::sparc:::::

References for CVE-2016-1291

URL	Tags
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160406-remcode	Vendor Advisory
http://www.securitytracker.com/id/1035497
https://blogs.securiteam.com/index.php/archives/2727	Third Party Advisory VDB Entry

URL

CVE-2016-1291

Exploit prediction scoring system (EPSS) score for CVE-2016-1291

Common vulnerability scoring system (CVSS) metrics for CVE-2016-1291

Weakness enumeration for CVE-2016-1291

Affected software / configurations for CVE-2016-1291

References for CVE-2016-1291