IO
Product
IOS
by Cisco · last CVE Aug 5, 2026
On CISA KEVExploited in the wild
618
CVEs
39
On KEV
9.8
Max CVSS
0
New 30D
Severity mix
Critical 8High 134Medium 81Low 1
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CVECVSSEPSSPublishedSummary · affected versions
CVE-2019-1757
5.9
1%
Mar 28
A vulnerability in the Cisco Smart Call Home feature of Cisco IOS and IOS XE Software could allow an unauthenticated, remote attacker to gain unauthorized read access to sensitive…
Affected: 2.3; 12.2(6)i1; 12.4(25e)jap1m; 12.4(25e)jap2; 12.4(25e)jap26; 12.4(25e)jaz1; +34 more
CVE-2018-0131
5.9
2%
Aug 14
A vulnerability in the implementation of RSA-encrypted nonces in Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to obtain the…
Affected: 15.5(3)s
CVE-2017-12228
5.9
1%
Sep 29
A vulnerability in the Cisco Network Plug and Play application of Cisco IOS 12.4 through 15.6 and Cisco IOS XE 3.3 through 16.4 could allow an unauthenticated, remote attacker to…
Affected: 12.4(25e)jao3a; 12.4(25e)jao20s; 12.4(25e)jap1n; 12.4(25e)jap9; 15.0(2)ej; 15.0(2)ej1; +34 more
CVE-2011-4667
5.9
1%
Sep 25
The encryption library in Cisco IOS Software 15.2(1)T, 15.2(1)T1, and 15.2(2)T, Cisco NX-OS in Cisco MDS 9222i Multiservice Modular Switch, Cisco MDS 9000 18/4-Port Multiservice…
Affected: 12.2(33)sxi; 12.2(33)sxj; 15.2(1)t; 15.2(1)t1; 15.2(2)t
CVE-2017-3850
5.9
2%
Mar 21
A vulnerability in the Autonomic Networking Infrastructure (ANI) feature of Cisco IOS Software (15.4 through 15.6) and Cisco IOS XE Software (3.7 through 3.18, and 16) could allow…
Affected: 15.2(3)e; 15.2(3)e1; 15.2(3)e2; 15.2(3)e3; 15.2(4)e; 15.2(4)e1; +34 more
CVE-2016-6403
5.9
2%
Sep 18
The Data in Motion (DMo) application in Cisco IOS 15.6(1)T and IOS XE, when the IOx feature set is enabled, allows remote attackers to cause a denial of service via a crafted…
Affected: through 15.6\(1\)t
CVE-2024-20465
5.8
0%
Sep 25
A vulnerability in the access control list (ACL) programming of Cisco IOS Software running on Cisco Industrial Ethernet 4000, 4010, and 5000 Series Switches could allow an…
Affected: 15.2(8)e2; 15.2(8)e3; 15.2(8)e4; 15.2(8)e5
CVE-2021-1377
5.8
1%
Mar 24
A vulnerability in Address Resolution Protocol (ARP) management of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to prevent an…
Affected: 12.2(6)i1; 15.1(3)svr1; 15.1(3)svr2; 15.1(3)svr3; 15.1(3)svs; 15.1(3)svs1; +34 more
CVE-2020-3477
5.5
0%
Sep 24
A vulnerability in the CLI parser of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, local attacker to access files from the flash: filesystem
Affected: 16.3.11
CVE-2018-0123
5.5
0%
Feb 8
A Path Traversal vulnerability in the diagnostic shell for Cisco IOS and IOS XE Software could allow an authenticated, local attacker to use certain diagnostic shell commands that…
Affected: 16.7(1)
CVE-2010-3049
5.5
0%
Sep 25
Cisco IOS before 12.2(33)SXI allows local users to cause a denial of service (device reboot)
Affected: through 12.2\(33\)sxh2
CVE-2022-20724
5.3
1%
Apr 15
Multiple vulnerabilities in the Cisco IOx application hosting environment on multiple Cisco platforms could allow an attacker to inject arbitrary commands into the underlying host…
Affected: 15.2(5)e1; 15.2(5)e2c; 15.2(6)e0a; 15.2(6)e1; 15.2(6)e2a; 15.2(7)e; +34 more
CVE-2021-34705
5.3
1%
Sep 23
A vulnerability in the Voice Telephony Service Provider (VTSP) service of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to bypass…
Affected: 12.3(7)xm; 12.3(7)xr; 12.3(7)xr1; 12.3(7)xr2; 12.3(7)xr3; 12.3(7)xr4; +34 more
CVE-2020-3315
5.3
2%
May 6
Multiple Cisco products are affected by a vulnerability in the Snort detection engine that could allow an unauthenticated, remote attacker to bypass the configured file policies…
Affected: 15.2(7)e
CVE-2017-12211
5.3
2%
Sep 7
A vulnerability in the IPv6 Simple Network Management Protocol (SNMP) code of Cisco IOS and Cisco IOS XE Software could allow an authenticated, remote attacker to cause high CPU…
Affected: 3.16.1
CVE-2017-6624
5.3
1%
May 3
A vulnerability in Cisco IOS 15.5(3)M Software for Cisco CallManager Express (CME) could allow an unauthenticated, remote attacker to make unauthorized phone calls
Affected: 15.5(3)m
CVE-2016-6398
5.3
1%
Sep 12
The PPTP server in Cisco IOS 15.5(3)M does not properly initialize packet buffers, which allows remote attackers to obtain sensitive information from earlier network communication…
Affected: 15.5(3)m
CVE-2016-1459
5.3
1%
Jul 17
Cisco IOS 12.4 and 15.0 through 15.5 and IOS XE 3.13 through 3.17 allow remote authenticated users to cause a denial of service (device reload) via crafted attributes in a BGP…
Affected: 12.4(4)xc7; 12.4(15)t17; 12.4(19a); 12.4(22)yb2; 12.4(24)gc4; 12.4(24)gc5; +20 more
CVE-2016-1378
5.3
1%
Apr 14
Cisco IOS before 15.2(2)E1 on Catalyst switches allows remote attackers to obtain potentially sensitive software-version information via a request to the Network Mobility Services…
Affected: 15.1(1)sg; 15.1(1)sg1; 15.1(1)sg2; 15.1(1)sy; 15.1(1)sy1; 15.1(1)sy2; +22 more
CVE-2022-20725
4.8
1%
Apr 15
Multiple vulnerabilities in the Cisco IOx application hosting environment on multiple Cisco platforms could allow an attacker to inject arbitrary commands into the underlying host…
Affected: 15.2(5)e1; 15.2(5)e2c; 15.2(6)e0a; 15.2(6)e1; 15.2(6)e2a; 15.2(7)e; +34 more
CVE-2019-12668
4.8
1%
Sep 25
A vulnerability in the web framework code of Cisco IOS and Cisco IOS XE Software could allow an authenticated, remote attacker to conduct a stored cross-site scripting (XSS)…
Affected: 15.2(2)e; 15.2(2)ea; 15.2(3)e; 15.2(3)ea; 15.2(4)e; 15.2(4)ea; +6 more
CVE-2025-20137
4.7
0%
May 7
A vulnerability in the access control list (ACL) programming of Cisco IOS Software that is running on Cisco Catalyst 1000 Switches and Cisco Catalyst 2960L Switches could allow an…
Affected: 15.2(5a)e; 15.2(5b)e; 15.2(5c)e; 15.2(6)e; 15.2(6)e0c; 15.2(6)e1; +29 more
CVE-2020-3231
4.7
0%
Jun 3
A vulnerability in the 802.1X feature of Cisco Catalyst 2960-L Series Switches and Cisco Catalyst CDB-8P Switches could allow an unauthenticated, adjacent attacker to forward…
Affected: 15.2(5)e2; 15.2(5)ex; 15.2(5a)e; 15.2(5b)e; 15.2(5c)e; 15.2(6)e; +16 more
CVE-2017-3803
4.7
1%
Jan 26
A vulnerability in the Cisco IOS Software forwarding queue of Cisco 2960X and 3750X switches could allow an unauthenticated, adjacent attacker to cause a memory leak in the…
Affected: 15.2(2)e3; 15.2(4)e1
CVE-2022-20661
4.6
0%
Apr 15
Multiple vulnerabilities that affect Cisco Catalyst Digital Building Series Switches and Cisco Catalyst Micro Switches could allow an attacker to execute persistent code at boot…
Affected: 15.2\(5\)ex before 15.2\(7\)e5; 15.2\(5\)ex before 15.2\(7\)e5; 15.2(8)e
CVE-2019-1762
4.4
0%
Mar 28
A vulnerability in the Secure Storage feature of Cisco IOS and IOS XE Software could allow an authenticated, local attacker to access sensitive system information on an affected…
Affected: 12.2(6)i1; 15.1(2)sg8a; 15.1(3)svg3d; 15.1(3)svi1b; 15.1(3)svm3; 15.1(3)svn2; +25 more
CVE-2017-12289
4.4
0%
Oct 19
A vulnerability in conditional, verbose debug logging for the IPsec feature of Cisco IOS XE Software could allow an authenticated, local attacker to display sensitive IPsec…
Affected: through 16.7.1
CVE-2019-1761
4.3
1%
Mar 28
A vulnerability in the Hot Standby Router Protocol (HSRP) subsystem of Cisco IOS and IOS XE Software could allow an unauthenticated, adjacent attacker to receive potentially…
Affected: 12.2(6)i1; 12.2(33)cx; 12.2(33)cy; 12.2(33)cy1; 12.2(33)cy2; 12.2(33)ira; +34 more
CVE-2019-1758
4.3
1%
Mar 28
A vulnerability in 802.1x function of Cisco IOS Software on the Catalyst 6500 Series Switches could allow an unauthenticated, adjacent attacker to access the network prior to…
Affected: 12.2(33)sxj6; 12.2(33)sxj7; 12.2(33)sxj8; 12.2(33)sxj9; 12.2(33)sxj10; 12.2(60)ez12; +34 more
CVE-2017-6770
4.2
2%
Aug 7
Cisco IOS 12.0 through 15.6, Adaptive Security Appliance (ASA) Software 7.0.1 through 9.7.1.2, NX-OS 4.0 through 12.0, and IOS XE 3.6 through 3.18 are affected by a vulnerability…
Affected: 12.0(1); 12.0(1)t; 12.0(1)xe; 12.0(1a); 12.0(2); 12.0(2)s; +34 more
CVE-1999-0524
4.0
32%
Aug 1
ICMP information such as (1) netmask and (2) timestamp is allowed from arbitrary hosts
Affected: All versions, or not specified
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The 500 most important CVEs for this product (exploited first, then by severity)