CVE-2020-14303: canonical ubuntu_linux Excessive Iteration
Vulnerability summary
CVE-2020-14303 is a high (CVSS 7.5) Excessive Iteration vulnerability in canonical ubuntu_linux. EPSS estimates a 3.54% chance of exploitation in the next 30 days, higher than 89.2% of scored vulnerabilities.
Severe, CVSS 7.5 (NVD); no exploitation reported by the 5 checked sources; EPSS 4% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 9 · Related 7Timeline
- 06-07-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
A flaw was found in the AD DC NBT server in all Samba versions before 4.10.17, before 4.11.11 and before 4.12.4. A samba user could send an empty UDP packet to cause the samba server to crash.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · AlpineEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
3.54%
Chance of exploitation in the next 30 days
Percentile
89%
Versus all other CVEs
30-day change
No change 0.00 pp
From 3.54% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Debian2 products
- samba< 2:4.12.5+dfsg-1
- debian_linuxEOL9.0
Alpine1 product
- samba≥ 4.10.0, < 4.10.17-r0 | ≥ 4.10.0, < 4.11.14-r0 | ≥ 4.10.0, < 4.12.5-r0
Canonical1 product
- ubuntu_linuxEOL12.04 | 14.04 | 16.04 | 18.04 | 20.04
Fedoraproject1 product
- fedoraEOL31
Opensuse1 product
- leapEOL15.1 | 15.2
Samba1 product
- samba≥ 4.10.0, < 4.10.17 | ≥ 4.11.0, < 4.11.11 | ≥ 4.12.0, < 4.12.4
Ubuntu1 product
- samba< 2:4.3.11+dfsg-0ubuntu0.16.04.29 | < 2:4.7.6+dfsg~ubuntu-0ubuntu2.18 | < 2:4.11.6+dfsg-0ubuntu1.4 | < 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm8
7 vendors · 8 products
References
17 links- bugzilla.redhat.com/show_bug.cgi?id=1851298%3BX Refsource MISC
- lists.opensuse.org/opensuse-security-announce/2020-07/msg00030.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2020-07/msg00054.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2020-09/msg00002.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
Show all 17 references
lists.debian.org/debian-lts-announce/2020/11/msg00041.htmlMailing ListX Refsource MLISTThird Party Advisory