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CVE-2018-20685 OpenSSH

Affected softwareOpenSSH
Severity5.3 Medium CVSS 3.1 3 scores
WeaknessIncorrect authorization (CWE-863)
Published10 Jan 2019
Updated17 Jun 2026

Description

In OpenSSH 7.9, scp.c in the scp client allows remote SSH servers to bypass intended access restrictions via the filename of . or an empty filename. The impact is modifying the permissions of the target directory on the client side.

Exploitation status

Exploited

Real-world exploitation reported by VulnCheck KEV. CISA has not confirmed it.

  • CISA KEV not listed
  • VulnCheck KEV listed Exploitation reported in the wild. 5 citations · earliest 2020-07-19.
  • CISA Vulnrichment exploitation: none
  • Indexed PoC none indexed
  • EPSS 3.7% chance in 30 days

Waratek protection

Outside Waratek scope

A Java vulnerability, but not one Waratek protects. It affects only Java on a user's desktop (applets, Web Start, JavaFX, the installer), sits in a product the Waratek agent can't be installed into, or is in a package we don't expect in business applications. The decision below says which.

  • Protection none
  • Action not pursued none
  • Review human Researcher
  • Record active
Decided by Manual classification of this CVE in the legacy dataset
Finding A manual classification set this CVE's status to Outside Waratek scope, but the CVE names a tracked product.

CVSS

5.3 MEDIUM v3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N 3 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 3.1 5.3 MEDIUM CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N NVD Primary published
CVSS 3.1 5.3 MEDIUM CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N CISA-ADP Secondary
CVSS 2.0 2.6 none AV:N/AC:H/Au:N/C:N/I:P/A:N NVD Primary

Affected software and releases

Oracle advisories

AdvisoryTypeQuarterProducts Oracle names in its risk matrix
Oracle Critical Patch Update April 2019 ↗ CPU 2019-Q2 Oracle Sun Systems Products Suite / SunSSH (10)

Oracle components and versions

FamilyComponentVersions, as Oracle lists themRead as
Oracle Sun Systems Products Suite SunSSH 10 10

Products and versions

22 products, 40 version entries
SourceVendorProductSchemeAffected versions
nvd canonical ubuntu linux generic 14.04 · 16.04 · 18.04 · 18.10
nvd debian debian linux generic 8.0 · 9.0
nvd fujitsu m10-1 firmware generic < 2361 · < 3070
nvd fujitsu m10-4 firmware generic < 2361 · < 3070
nvd fujitsu m10-4s firmware generic < 2361 · < 3070
nvd fujitsu m12-1 firmware generic < 2361 · < 3070
nvd fujitsu m12-2 firmware generic < 2361 · < 3070
nvd fujitsu m12-2s firmware generic < 2361 · < 3070
nvd netapp cloud backup generic any version
nvd netapp element software generic any version
nvd netapp ontap select deploy generic any version
nvd netapp steelstore cloud integrated storage generic any version
nvd netapp storage automation store generic any version
nvd openbsd openssh generic ≤ 7.9
nvd oracle solaris generic 10
nvd redhat enterprise linux generic 7.0 · 8.0
nvd redhat enterprise linux eus generic 8.1 · 8.2 · 8.4 · 8.6
nvd redhat enterprise linux server aus generic 8.2 · 8.4 · 8.6
nvd redhat enterprise linux server tus generic 8.2 · 8.4 · 8.6
nvd siemens scalance x204rna eec firmware generic < 3.2.7
nvd siemens scalance x204rna firmware generic < 3.2.7
nvd winscp winscp generic ≤ 5.13

Earlier manual review

A reviewer classified this CVE in an older dataset. We kept the labels and products below, but not the reviewer's reasoning.

## Manual Classification Context **Labels:** SSH, NO AUTH REMOTE EXPLOIT, SUNSSH **Products:** ORACLE SUN SYSTEMS PRODUCTS SUITE, ORACLE SOLARIS, OPENSSH

References

URLTags
http://www.securityfocus.com/bid/106531 Broken Link
https://access.redhat.com/errata/RHSA-2019:3702 Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf Patch, Third Party Advisory
https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/scp.c.diff?r1=1.197&r2=1.198&f=h Patch
https://github.com/openssh/openssh-portable/commit/6010c0303a422a9c5fa8860c061bf7105eb7f8b2 Patch
https://lists.debian.org/debian-lts-announce/2019/03/msg00030.html Mailing List, Third Party Advisory
https://security.gentoo.org/glsa/201903-16 Third Party Advisory
https://security.gentoo.org/glsa/202007-53 Third Party Advisory
https://security.netapp.com/advisory/ntap-20190215-0001/ Third Party Advisory
https://sintonen.fi/advisories/scp-client-multiple-vulnerabilities.txt Patch, Third Party Advisory

Timeline

Published2019-01-10By the CVE Program.
VulnCheck KEV: earliest evidence2020-07-19Date of the oldest evidence of exploitation in VulnCheck KEV's record. VulnCheck does not publish the date it listed the CVE.
VulnCheck KEV: latest evidence2023-02-14Date of the newest report, exploit reference or honeypot sighting in VulnCheck KEV's record.
NVD record modified2026-06-17NVD's own last-modified date for this record.