5

CVE-2011-4539: canonical ubuntu_linux Improper Input Validation

CVSS: 5.0v2.0MediumModified
AliasesRHSA-2011:1819DEBIAN-CVE-2011-4539
Published 08-12-2011Last modified 07-08-2024
Open JSON

Vulnerability summary

CVE-2011-4539 is a medium (CVSS 5.0) Improper Input Validation vulnerability in canonical ubuntu_linux. EPSS estimates a 15.22% chance of exploitation in the next 30 days, higher than 96.7% of scored vulnerabilities.

Overall risk
23/100
0100
Low · default modelHow is this calculated?
CVSS score
5.0/10
010
Medium · v2.0 (NVD)
EPSS score
15.22%
0%100%
Medium · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3 · Related 1
DSA-2519-1DSA-2519-2OPENSUSE-SU-2024:10358-1

Timeline

  1. 08-12-2011
    PublishedVulnerability first disclosed.
  2. 07-08-2024
    Last modifiedVulnerability information updated.

Description

dhcpd in ISC DHCP 4.x before 4.2.3-P1 and 4.1-ESV before 4.1-ESV-R4 does not properly handle regular expressions in dhcpd.conf, which allows remote attackers to cause a denial of service (daemon crash) via a crafted request packet.

CVSS metrics

1 score · 1 source · 1 version

EPSS trend

Probability

15.22%

Chance of exploitation in the next 30 days

Percentile

97%

Versus all other CVEs

30-day change

0.00 pp

From 15.22% on 19-09-2026

19-09-202619-10-2026
EPSS score
15.22%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Redhat5 products
  • dhclient< 12:4.1.1-25.P1.el6_2.1
  • dhcp< 12:4.1.1-25.P1.el6_2.1
  • dhcp-common< 12:4.1.1-25.P1.el6_2.1
  • dhcp-debuginfo< 12:4.1.1-25.P1.el6_2.1
  • dhcp-devel< 12:4.1.1-25.P1.el6_2.1
Debian2 products
Canonical1 product
Isc1 product
  • dhcp4.0 | 4.0.0 | 4.0.1 | 4.0.1:b1 | 4.0.1:rc1 | 4.0.2 | 4.0.2:b1 | 4.0.2:b2 | 4.0.2:b3 | 4.0.2:rc1 | 4.0.3 | 4.0.3:b1 | 4.0.3:rc1 | 4.1.1:b3 | 4.1.1:rc1 | 4.1.2 | 4.2.0 | 4.2.0:a1 | 4.2.0:a2 | 4.2.0:b1 | 4.2.0:b2 | 4.2.0:p1 | 4.2.0:rc1 | 4.2.1 | 4.2.1:b1 | 4.2.1:rc1 | 4.2.2 | 4.2.2:b1 | 4.2.2:rc1 | 4.2.3 | 4.1-esv | 4.1-esv:r1 | 4.1-esv:r2 | 4.1-esv:r3 | 4.1-esv:r3_b1

4 vendors · 9 products

References

22 links
Show all 22 references