CVE-2001-1244

Exp

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.

Published: 2001-07-07 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2001-1244 is rated High Exploit Risk (72.9/100): CVSS Medium severity, with high exploitation likelihood (EPSS 20.73%, 97th percentile). 2 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +3.93% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2001-1244

EDB-ID Source Kind Published Link
20997 exploit_db edb 2001-07-07 Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2001-1244

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 16.80% 20.73% +3.93%
2 2026-01-10 19.59% 16.80% -2.79%
3 2025-12-28 — 19.59% —

Full EPSS history (17 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2001-1244

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2001-1244

Affected software / configurations for CVE-2001-1244

Vendor Product Version Raw CPE
freebsd freebsd 4.3 cpe:2.3:o:freebsd:freebsd:4.3:*:*:*:*:*:*:*
hp hp-ux 11.00 cpe:2.3:o:hp:hp-ux:11.00:*:*:*:*:*:*:*
hp hp-ux 11.0.4 cpe:2.3:o:hp:hp-ux:11.0.4:*:*:*:*:*:*:*
hp hp-ux 11.11 cpe:2.3:o:hp:hp-ux:11.11:*:*:*:*:*:*:*
hp vvos 11.04 cpe:2.3:o:hp:vvos:11.04:*:*:*:*:*:*:*
linux linux_kernel 2.4.0 cpe:2.3:o:linux:linux_kernel:2.4.0:*:*:*:*:*:*:*
linux linux_kernel 2.4.1 cpe:2.3:o:linux:linux_kernel:2.4.1:*:*:*:*:*:*:*
linux linux_kernel 2.4.2 cpe:2.3:o:linux:linux_kernel:2.4.2:*:*:*:*:*:*:*
linux linux_kernel 2.4.3 cpe:2.3:o:linux:linux_kernel:2.4.3:*:*:*:*:*:*:*
linux linux_kernel 2.4.4 cpe:2.3:o:linux:linux_kernel:2.4.4:*:*:*:*:*:*:*
linux linux_kernel 2.4.5 cpe:2.3:o:linux:linux_kernel:2.4.5:*:*:*:*:*:*:*
microsoft windows_2000 — cpe:2.3:o:microsoft:windows_2000:*:*:workstation:*:*:*:*:*
microsoft windows_2000 — cpe:2.3:o:microsoft:windows_2000:*:sp1:*:*:*:*:*:*
microsoft windows_2000 — cpe:2.3:o:microsoft:windows_2000:*:sp2:*:*:*:*:*:*
microsoft windows_nt 4.0 cpe:2.3:o:microsoft:windows_nt:4.0:*:*:*:*:*:*:*
microsoft windows_nt 4.0 cpe:2.3:o:microsoft:windows_nt:4.0:sp1:*:*:*:*:*:*
microsoft windows_nt 4.0 cpe:2.3:o:microsoft:windows_nt:4.0:sp2:*:*:*:*:*:*
microsoft windows_nt 4.0 cpe:2.3:o:microsoft:windows_nt:4.0:sp3:*:*:*:*:*:*
microsoft windows_nt 4.0 cpe:2.3:o:microsoft:windows_nt:4.0:sp4:*:*:*:*:*:*
microsoft windows_nt 4.0 cpe:2.3:o:microsoft:windows_nt:4.0:sp5:*:*:*:*:*:*
microsoft windows_nt 4.0 cpe:2.3:o:microsoft:windows_nt:4.0:sp6:*:*:*:*:*:*
microsoft windows_nt 4.0 cpe:2.3:o:microsoft:windows_nt:4.0:sp6a:*:*:*:*:*:*
netbsd netbsd 1.5 cpe:2.3:o:netbsd:netbsd:1.5:*:*:*:*:*:*:*
netbsd netbsd 1.5.1 cpe:2.3:o:netbsd:netbsd:1.5.1:*:*:*:*:*:*:*
openbsd openbsd 2.8 cpe:2.3:o:openbsd:openbsd:2.8:*:*:*:*:*:*:*
openbsd openbsd 2.9 cpe:2.3:o:openbsd:openbsd:2.9:*:*:*:*:*:*:*
sun sunos 5.5.1 cpe:2.3:o:sun:sunos:5.5.1:*:*:*:*:*:*:*
sun sunos 5.7 cpe:2.3:o:sun:sunos:5.7:*:*:*:*:*:*:*
sun sunos 5.8 cpe:2.3:o:sun:sunos:5.8:*:*:*:*:*:*:*

References for CVE-2001-1244

cvelogic Threat Intelligence