CVE-2015-7855: debian debian_linux Improper Input Validation
CVSS: 6.5v3.1MediumModified
AliasesUBUNTU-CVE-2015-7855DEBIAN-CVE-2015-7855
Published 07-08-2017Last modified 06-08-2024
Vulnerability summary
CVE-2015-7855 is a medium (CVSS 6.5) Improper Input Validation vulnerability in debian debian_linux. EPSS estimates a 31.07% chance of exploitation in the next 30 days, higher than 98.2% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
6.5/10
010
Medium · v3.1 (NVD)EPSS score
31.07%
0%100%
High · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1exploit-database
Advisory lineage
Upstream 0 · Downstream 8 · Related 5Timeline
- 07-08-2017PublishedVulnerability first disclosed.
- 06-08-2024Last modifiedVulnerability information updated.
Description
The decodenetnum function in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to cause a denial of service (assertion failure) via a 6 or mode 7 packet containing a long data value.
CVSS metrics
5 scores · 3 sources · 3 versionsMedium 6.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Medium 6.5Preferred score · OSV · Ubuntu (Ecosystem advisory) · calculated from vector
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HSourcesSingle source
Medium 4.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:S/C:N/I:N/A:PSourcesSingle source
EPSS trend
Probability
31.07%
Chance of exploitation in the next 30 days
Percentile
98%
Versus all other CVEs
30-day change
0.00 pp
From 31.07% on 18-09-2026
18-09-202618-10-2026
EPSS score31.07%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundNTP 4.2.8p3 - Denial of Service
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Netapp5 products
Debian2 products
- ntp< 1:4.2.8p4+dfsg-1
- debian_linuxEOL7.0 | 8.0 | 9.0
Ntp1 product
- ntp≥ 4.2.0, < 4.2.8 | ≥ 4.3.0, < 4.3.77 | 4.2.8 | 4.2.8:p1 | 4.2.8:p1-beta1 | 4.2.8:p1-beta2 | 4.2.8:p1-beta3 | 4.2.8:p1-beta4 | 4.2.8:p1-beta5 | 4.2.8:p1-rc1 | 4.2.8:p1-rc2 | 4.2.8:p2 | 4.2.8:p2-rc1 | 4.2.8:p2-rc2 | 4.2.8:p2-rc3 | 4.2.8:p3 | 4.2.8:p3-rc1 | 4.2.8:p3-rc2 | 4.2.8:p3-rc3
Ubuntu1 product
- ntp< 1:4.2.6.p5+dfsg-3ubuntu2.14.04.5
4 vendors · 9 products
References
16 links
- bugzilla.redhat.com/show_bug.cgi?id=1274264X Refsource CONFIRMIssue TrackingThird Party AdvisoryVDB Entry
- h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05270839X Refsource CONFIRMThird Party AdvisoryVDB Entry
Show all 16 references
us-cert.cisa.gov/ics/advisories/icsa-21-103-11X Refsource CONFIRMThird Party AdvisoryUS Government Resource