SOC status:Duty analyst on shift

UK Cyber Defence
VulnerabilityModified

CVE-2001-0191

gnuserv before 3.12, as shipped with XEmacs, does not properly check the specified length of an X Windows MIT-MAGIC-COOKIE cookie, which allows remote attackers to execute arbitrary commands via a buffer overflow, or brute force authentication by using…

HIGH 10.0EPSS 5.50%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (5.50%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

gnuserv before 3.12, as shipped with XEmacs, does not properly check the specified length of an X Windows MIT-MAGIC-COOKIE cookie, which allows remote attackers to execute arbitrary commands via a buffer overflow, or brute force authentication by using a short cookie length.

CVSS 2.0
10.0 HIGHAV:N/AC:L/Au:N/C:C/I:C/A:C
EPSS
5.50% probability · 93th percentile
Public exploits
None in Exploit-DB
CISA KEV
Not listed
Weakness
CWE-120
Affected
andynorman/gnuserv
Source
cve@mitre.org
EPSS trend
0%5%10%26 October 2026: 5.50%26 October 202626 October 2026

EPSS 5.5% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.