CVE-2001-0864
Cisco 12000 with IOS 12.0 and line cards based on Engine 2 does not properly handle the implicit "deny ip any any" rule in an outgoing ACL when the ACL contains exactly 448 entries, which can allow some outgoing packets to bypass access restrictions.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.39%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Cisco 12000 with IOS 12.0 and line cards based on Engine 2 does not properly handle the implicit "deny ip any any" rule in an outgoing ACL when the ACL contains exactly 448 entries, which can allow some outgoing packets to bypass access restrictions.
- CVSS 2.0
- 7.5 HIGHAV:N/AC:L/Au:N/C:P/I:P/A:P
- EPSS
- 1.39% probability · 72th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Affected
- cisco/12000 router
- Source
- cve@mitre.org
EPSS 1.4% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.ciac.org/ciac/bulletins/m-018.shtml
- http://www.cisco.com/warp/public/707/GSR-ACL-pub.shtmlPatch, Vendor Advisory
- http://www.osvdb.org/1986
- http://www.securityfocus.com/bid/3536
- https://exchange.xforce.ibmcloud.com/vulnerabilities/7553
- http://www.ciac.org/ciac/bulletins/m-018.shtml
- http://www.cisco.com/warp/public/707/GSR-ACL-pub.shtmlPatch, Vendor Advisory
- http://www.osvdb.org/1986
- http://www.securityfocus.com/bid/3536
- https://exchange.xforce.ibmcloud.com/vulnerabilities/7553
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.