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CVE-2001-0288

30
FAUCET Score

CVE-2001-0288 describes a vulnerability in Cisco switches and routers running IOS 12.1 and earlier, where predictable TCP Initial Sequence Numbers (ISNs) are generated. This flaw allows remote attackers to spoof or hijack TCP connections, posing a significant risk to network integrity. With a CVSS score of 7.5 (HIGH), the vulnerability is easily exploitable over the network with low attack complexity, potentially leading to partial compromise of confidentiality, integrity, and availability. While there is no evidence of active exploitation or specific Metasploit/Nuclei modules, a related exploit for Linux Kernel 2.2's predictable ISNs exists on ExploitDB, and the CVE has no community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 12.1CPE matchmatch criteria
cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.5HIGH

AV:N/AC:L/Au:N/C:P/I:P/A:P

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
6.4
CvssVersion
2.0

Exploit Intelligence

EPSS Score
5.41%
Probability of exploitation in next 30 days
EPSS Percentile
91.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
ExploitDB: EDB-19522 · Sep 27, 1999
This CVE's current EPSS score of 0.0541 is in the 86th percentile among its peer group of 51,485 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

cisco.com / warp/public/707/ios-tcp-isn-random-pub.shtml
PatchVendor Advisory