Vulnerability Database

383,304

Total vulnerabilities in the database

CVE-2020-10188 — netkit_telnet_project / netkit_telnet

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

utility.c in telnetd in netkit telnet through 0.17 allows remote attackers to execute arbitrary code via short writes or urgent data, because of a buffer overflow involving the netclear and nextitem functions.

  • Published: Mar 6, 2020
  • Updated: Sep 13, 2026
  • CVE: CVE-2020-10188
  • Severity: Critical
  • Exploit:
  • CISA KEV:

CVSS v3:

  • Severity: Critical
  • Score: 9.8
  • AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v2:

  • Severity: High
  • Score: 10
  • AV:N/AC:L/Au:N/C:C/I:C/A:C

CWEs:

Software Affected versions
netkit_telnet_project / netkit_telnet <= 0.17
fedoraproject / fedora = 30
fedoraproject / fedora = 31
fedoraproject / fedora = 32
debian / debian_linux = 8.0
debian / debian_linux = 9.0
arista / eos <= 4.20.15
arista / eos >= 4.21.0, <= 4.21.10m
arista / eos >= 4.22, <= 4.22.4m
arista / eos >= 4.23, <= 4.23.3m
arista / eos = 4.24.0f
oracle / communications_performance_intelligence_center = 10.4.0.2
juniper / junos = 12.3
juniper / junos = 12.3-r1
juniper / junos = 12.3-r10
juniper / junos = 12.3-r10-s1
juniper / junos = 12.3-r10-s2
juniper / junos = 12.3-r11
juniper / junos = 12.3-r12
juniper / junos = 12.3-r12-s1
juniper / junos = 12.3-r12-s10
juniper / junos = 12.3-r12-s11
juniper / junos = 12.3-r12-s12
juniper / junos = 12.3-r12-s13
juniper / junos = 12.3-r12-s14
juniper / junos = 12.3-r12-s15
juniper / junos = 12.3-r12-s3
juniper / junos = 12.3-r12-s4
juniper / junos = 12.3-r12-s6
juniper / junos = 12.3-r12-s8
juniper / junos = 12.3-r13
juniper / junos = 12.3-r2
juniper / junos = 12.3-r3
juniper / junos = 12.3-r4
juniper / junos = 12.3-r5
juniper / junos = 12.3-r6
juniper / junos = 12.3-r7
juniper / junos = 12.3-r8
juniper / junos = 12.3-r9
juniper / junos = 12.3r12
juniper / junos = 12.3x48
juniper / junos = 12.3x48-d10
juniper / junos = 12.3x48-d100
juniper / junos = 12.3x48-d15
juniper / junos = 12.3x48-d20
juniper / junos = 12.3x48-d25
juniper / junos = 12.3x48-d30
juniper / junos = 12.3x48-d35
juniper / junos = 12.3x48-d40
juniper / junos = 12.3x48-d45
juniper / junos = 12.3x48-d50
juniper / junos = 12.3x48-d51
juniper / junos = 12.3x48-d55
juniper / junos = 12.3x48-d60
juniper / junos = 12.3x48-d65
juniper / junos = 12.3x48-d66
juniper / junos = 12.3x48-d70
juniper / junos = 12.3x48-d75
juniper / junos = 12.3x48-d80
juniper / junos = 12.3x48-d85
juniper / junos = 12.3x48-d90
juniper / junos = 12.3x48-d95
juniper / junos = 12.3x50
juniper / junos = 12.3x50-d20
juniper / junos = 12.3x50-d30
juniper / junos = 12.3x50-d35
juniper / junos = 12.3x50-d40
juniper / junos = 12.3x50-d45
juniper / junos = 15.1
juniper / junos = 15.1-a1
juniper / junos = 15.1-f
juniper / junos = 15.1-f1
juniper / junos = 15.1-f2
juniper / junos = 15.1-f2-s1
juniper / junos = 15.1-f2-s2
juniper / junos = 15.1-f2-s3
juniper / junos = 15.1-f2-s4
juniper / junos = 15.1-f3
juniper / junos = 15.1-f4
juniper / junos = 15.1-f5
juniper / junos = 15.1-f5-s7
juniper / junos = 15.1-f6
juniper / junos = 15.1-f6-s1
juniper / junos = 15.1-f6-s10
juniper / junos = 15.1-f6-s12
juniper / junos = 15.1-f6-s2
juniper / junos = 15.1-f6-s3
juniper / junos = 15.1-f6-s4
juniper / junos = 15.1-f6-s5
juniper / junos = 15.1-f6-s6
juniper / junos = 15.1-f6-s7
juniper / junos = 15.1-f6-s8
juniper / junos = 15.1-f6-s9
juniper / junos = 15.1-f7
juniper / junos = 15.1-r
juniper / junos = 15.1-r1
juniper / junos = 15.1-r2
juniper / junos = 15.1-r3
juniper / junos = 15.1-r4
juniper / junos = 15.1-r4-s7
juniper / junos = 15.1-r4-s8
juniper / junos = 15.1-r4-s9
juniper / junos = 15.1-r5
juniper / junos = 15.1-r5-s1
juniper / junos = 15.1-r5-s3
juniper / junos = 15.1-r5-s5
juniper / junos = 15.1-r5-s6
juniper / junos = 15.1-r6
juniper / junos = 15.1-r6-s1
juniper / junos = 15.1-r6-s2
juniper / junos = 15.1-r6-s3
juniper / junos = 15.1-r6-s4
juniper / junos = 15.1-r6-s6
juniper / junos = 15.1-r7
juniper / junos = 15.1-r7-s1
juniper / junos = 15.1-r7-s2
juniper / junos = 15.1-r7-s3
juniper / junos = 15.1-r7-s4
juniper / junos = 15.1-r7-s5
juniper / junos = 15.1-r7-s6
juniper / junos = 15.1x49
juniper / junos = 15.1x49-d10
juniper / junos = 15.1x49-d100
juniper / junos = 15.1x49-d110
juniper / junos = 15.1x49-d120
juniper / junos = 15.1x49-d130
juniper / junos = 15.1x49-d131
juniper / junos = 15.1x49-d140
juniper / junos = 15.1x49-d15
juniper / junos = 15.1x49-d150
juniper / junos = 15.1x49-d160
juniper / junos = 15.1x49-d170
juniper / junos = 15.1x49-d180
juniper / junos = 15.1x49-d190
juniper / junos = 15.1x49-d20
juniper / junos = 15.1x49-d200
juniper / junos = 15.1x49-d210
juniper / junos = 15.1x49-d25
juniper / junos = 15.1x49-d30
juniper / junos = 15.1x49-d35
juniper / junos = 15.1x49-d40
juniper / junos = 15.1x49-d45
juniper / junos = 15.1x49-d50
juniper / junos = 15.1x49-d55
juniper / junos = 15.1x49-d60
juniper / junos = 15.1x49-d65
juniper / junos = 15.1x49-d70
juniper / junos = 15.1x49-d75
juniper / junos = 15.1x49-d80
juniper / junos = 15.1x49-d90
juniper / junos = 16.1
juniper / junos = 16.1-r
juniper / junos = 16.1-r1
juniper / junos = 16.1-r2
juniper / junos = 16.1-r3
juniper / junos = 16.1-r3-s10
juniper / junos = 16.1-r3-s11
juniper / junos = 16.1-r3-s8
juniper / junos = 16.1-r4
juniper / junos = 16.1-r4-s12
juniper / junos = 16.1-r4-s2
juniper / junos = 16.1-r4-s3
juniper / junos = 16.1-r4-s4
juniper / junos = 16.1-r4-s6
juniper / junos = 16.1-r4-s8
juniper / junos = 16.1-r4-s9
juniper / junos = 16.1-r5
juniper / junos = 16.1-r5-s4
juniper / junos = 16.1-r6
juniper / junos = 16.1-r6-s1
juniper / junos = 16.1-r6-s3
juniper / junos = 16.1-r6-s4
juniper / junos = 16.1-r6-s6
juniper / junos = 16.1-r7
juniper / junos = 16.1-r7-s2
juniper / junos = 16.1-r7-s3
juniper / junos = 16.1-r7-s4
juniper / junos = 16.1-r7-s5
juniper / junos = 16.1-r7-s6
juniper / junos = 16.1-r7-s7
juniper / junos = 17.2
juniper / junos = 17.2-r1
juniper / junos = 17.2-r1-s1
juniper / junos = 17.2-r1-s2
juniper / junos = 17.2-r1-s3
juniper / junos = 17.2-r1-s4
juniper / junos = 17.2-r1-s5
juniper / junos = 17.2-r1-s6
juniper / junos = 17.2-r1-s7
juniper / junos = 17.2-r1-s8
juniper / junos = 17.2-r2
juniper / junos = 17.2-r2-s11
juniper / junos = 17.2-r2-s4
juniper / junos = 17.2-r2-s6
juniper / junos = 17.2-r2-s7
juniper / junos = 17.2-r3
juniper / junos = 17.2-r3-s1
juniper / junos = 17.2-r3-s2
juniper / junos = 17.2-r3-s3
juniper / junos = 17.2x75
juniper / junos = 17.3
juniper / junos = 17.3-r1
juniper / junos = 17.3-r1-s1
juniper / junos = 17.3-r1-s4
juniper / junos = 17.3-r2
juniper / junos = 17.3-r2-s1
juniper / junos = 17.3-r2-s2
juniper / junos = 17.3-r2-s3
juniper / junos = 17.3-r2-s4
juniper / junos = 17.3-r2-s5
juniper / junos = 17.3-r3
juniper / junos = 17.3-r3-s1
juniper / junos = 17.3-r3-s2
juniper / junos = 17.3-r3-s3
juniper / junos = 17.3-r3-s4
juniper / junos = 17.3-r3-s5
juniper / junos = 17.3-r3-s6
juniper / junos = 17.3-r3-s7
juniper / junos = 17.3-r3-s8
juniper / junos = 17.4
juniper / junos = 17.4-r1
juniper / junos = 17.4-r1-s1
juniper / junos = 17.4-r1-s2
juniper / junos = 17.4-r1-s3
juniper / junos = 17.4-r1-s4
juniper / junos = 17.4-r1-s5
juniper / junos = 17.4-r1-s6
juniper / junos = 17.4-r1-s7
juniper / junos = 17.4-r2
juniper / junos = 17.4-r2-s1
juniper / junos = 17.4-r2-s10
juniper / junos = 17.4-r2-s2
juniper / junos = 17.4-r2-s3
juniper / junos = 17.4-r2-s4
juniper / junos = 17.4-r2-s5
juniper / junos = 17.4-r2-s6
juniper / junos = 17.4-r2-s7
juniper / junos = 17.4-r2-s8
juniper / junos = 17.4-r2-s9
juniper / junos = 17.4-r3
juniper / junos = 17.4-r3-s1
juniper / junos = 18.1
juniper / junos = 18.1-r1
juniper / junos = 18.1-r2
juniper / junos = 18.1-r2-s1
juniper / junos = 18.1-r2-s2
juniper / junos = 18.1-r2-s4
juniper / junos = 18.1-r3
juniper / junos = 18.1-r3-s1
juniper / junos = 18.1-r3-s2
juniper / junos = 18.1-r3-s3
juniper / junos = 18.1-r3-s4
juniper / junos = 18.1-r3-s5
juniper / junos = 18.1-r3-s6
juniper / junos = 18.1-r3-s7
juniper / junos = 18.1-r3-s8
juniper / junos = 18.1-r3-s9
juniper / junos = 18.2
juniper / junos = 18.2-r
juniper / junos = 18.2-r1
juniper / junos = 18.2-r1-s2
juniper / junos = 18.2-r1-s3
juniper / junos = 18.2-r1-s4
juniper / junos = 18.2-r1-s5
juniper / junos = 18.2-r2
juniper / junos = 18.2-r2-s1
juniper / junos = 18.2-r2-s2
juniper / junos = 18.2-r2-s3
juniper / junos = 18.2-r2-s4
juniper / junos = 18.2-r2-s5
juniper / junos = 18.2-r2-s6
juniper / junos = 18.2-r2-s7
juniper / junos = 18.2-r2-s8
juniper / junos = 18.2-r3
juniper / junos = 18.2-r3-s1
juniper / junos = 18.2-r3-s2
juniper / junos = 18.2-r3-s3
juniper / junos = 18.2-r3-s4
juniper / junos = 18.2x75
juniper / junos = 18.2x75-d12
juniper / junos = 18.2x75-d20
juniper / junos = 18.2x75-d30
juniper / junos = 18.2x75-d40
juniper / junos = 18.2x75-d411
juniper / junos = 18.2x75-d50
juniper / junos = 18.2x75-d51
juniper / junos = 18.2x75-d60
juniper / junos = 18.2x75-d10
juniper / junos = 18.3
juniper / junos = 18.3-r1
juniper / junos = 18.3-r1-s1
juniper / junos = 18.3-r1-s2
juniper / junos = 18.3-r1-s3
juniper / junos = 18.3-r1-s4
juniper / junos = 18.3-r1-s5
juniper / junos = 18.3-r1-s6
juniper / junos = 18.3-r2
juniper / junos = 18.3-r2-s1
juniper / junos = 18.3-r2-s2
juniper / junos = 18.3-r2-s3
juniper / junos = 18.3-r3
juniper / junos = 18.3-r3-s1
juniper / junos = 18.3-r3-s2
juniper / junos = 18.4
juniper / junos = 18.4-r1
juniper / junos = 18.4-r1-s1
juniper / junos = 18.4-r1-s2
juniper / junos = 18.4-r1-s3
juniper / junos = 18.4-r1-s4
juniper / junos = 18.4-r1-s5
juniper / junos = 18.4-r1-s6
juniper / junos = 18.4-r1-s7
juniper / junos = 18.4-r2
juniper / junos = 18.4-r2-s1
juniper / junos = 18.4-r2-s2
juniper / junos = 18.4-r2-s3
juniper / junos = 18.4-r2-s4
juniper / junos = 18.4-r3
juniper / junos = 18.4-r3-s1
juniper / junos = 18.4-r3-s2
juniper / junos = 18.4-r3-s3
juniper / junos = 19.1
juniper / junos = 19.1-r1
juniper / junos = 19.1-r1-s1
juniper / junos = 19.1-r1-s2
juniper / junos = 19.1-r1-s3
juniper / junos = 19.1-r1-s4
juniper / junos = 19.1-r1-s5
juniper / junos = 19.1-r1-s6
juniper / junos = 19.1-r2
juniper / junos = 19.1-r2-s1
juniper / junos = 19.1-r3
juniper / junos = 19.1-r3-s1
juniper / junos = 19.2
juniper / junos = 19.2-r1
juniper / junos = 19.2-r1-s1
juniper / junos = 19.2-r1-s2
juniper / junos = 19.2-r1-s3
juniper / junos = 19.2-r1-s4
juniper / junos = 19.3
juniper / junos = 19.3-r1
juniper / junos = 19.3-r1-s1
juniper / junos = 19.3-r2
juniper / junos = 19.3-r2-s1
juniper / junos = 19.3-r2-s2
juniper / junos = 19.4
juniper / junos = 19.4-r1
juniper / junos = 19.4-r1-s1
juniper / junos = 19.4-r1-s2
juniper / junos = 19.4-r2
juniper / junos = 20.1
juniper / junos = 20.1-r1
juniper / junos = 20.1-r1-s1

Frequently Asked Questions

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.