CVE-2001-1244

TCP MSS Handling - Amplified Traffic Denial of Service

Title source: manual
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2001-1244. PoCs published by Darren Reed.

AI-analyzed exploit summary This exploit demonstrates a TCP MSS (Maximum Segment Size) manipulation vulnerability to cause a denial of service by forcing a low MSS value and overwhelming the target system with fragmented packets. It uses raw sockets to send ICMP unreachable messages to manipulate the TCP connection.

Description

Multiple TCP implementations could allow remote attackers to cause a denial of service (bandwidth and CPU exhaustion) by setting the maximum segment size (MSS) to a very small number and requesting large amounts of data, which generates more packets with less TCP-level data that amplify network traffic and consume more server CPU to process.

Exploits (1)

exploitdb WORKING POC VERIFIED
by Darren Reed · cdosmultiple
https://www.exploit-db.com/exploits/20997

This exploit demonstrates a TCP MSS (Maximum Segment Size) manipulation vulnerability to cause a denial of service by forcing a low MSS value and overwhelming the target system with fragmented packets. It uses raw sockets to send ICMP unreachable messages to manipulate the TCP connection.

Classification
Working Poc 90%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: TCP stack implementations (various)
No auth needed
Prerequisites: Raw socket permissions · Network connectivity to target
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (3)

Core 3
Core References
Third Party Advisory, VDB Entry mailing-list x_refsource_bugtraq
http://www.securityfocus.com/archive/1/195457
Third Party Advisory, VDB Entry vdb-entry x_refsource_xf
https://exchange.xforce.ibmcloud.com/vulnerabilities/6824
Exploit, Vendor Advisory vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/2997

Scores

EPSS 0.3529
EPSS Percentile 98.2%

Details

Status published
Products (20)
freebsd/freebsd 4.3
hp/hp-ux 11.00
hp/hp-ux 11.0.4
hp/hp-ux 11.11
hp/vvos 11.04
linux/linux_kernel 2.4.0
linux/linux_kernel 2.4.1
linux/linux_kernel 2.4.2
linux/linux_kernel 2.4.3
linux/linux_kernel 2.4.4
... and 10 more
Published Jul 07, 2001
Tracked Since Feb 18, 2026