CVE-2023-1667

A NULL pointer dereference was found In libssh during re-keying with algorithm guessing. This issue may allow an authenticated client to cause a denial of service.

Published: 2023-05-26 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-1667 is rated Moderate Risk (54.1/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.27%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-1667

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-13 1.13% 1.27% +0.14%
2 2026-04-08 1.18% 1.13% -0.05%
3 2025-11-21 — 1.18% —

Full EPSS history (13 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-1667

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 3.6 [email protected]

Weakness enumeration for CVE-2023-1667

OS Trackers for CVE-2023-1667

vendor priority summary link
alpine — CVE-2023-1667: 1 source package rows (libssh); 8 state rows across 2 repos (3.22-community, edge-community); fixed 0, open 8. https://security.alpinelinux.org/vuln/CVE-2023-1667
debian not yet assigned CVE-2023-1667 not yet assigned priority: Debian including 1 source packages (libssh), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2023-1667
gentoo high CVE-2023-1667: 1 GLSA(s) (202312-05), 1 atom(s) (net-libs/libssh); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2023-1667
redhat medium — https://access.redhat.com/security/cve/CVE-2023-1667
suse medium CVE-2023-1667 severity moderate: SUSE including 335 source package names (1.2.3-2.2.63:libssh-config-0.9.8-150400.3.3.1, 1.2.3-2.2.63:libssh4-0.9.8-150400.3.3.1, …), 900 product×package rows across 258 product lines (Container bci/golang, Container bci/nodejs, … (258 product lines)): Fixed 602, Known Affected 195, Known Not Affected 103. https://www.suse.com/security/cve/CVE-2023-1667/
ubuntu medium CVE-2023-1667 medium priority: Ubuntu including 1 source packages (libssh), 12 status rows across 12 suites (bionic, focal, jammy, kinetic, lunar, mantic, noble, oracular, plucky, trusty, upstream, xenial): released 9, ignored 3. https://ubuntu.com/security/CVE-2023-1667

Affected software / configurations for CVE-2023-1667

Vendor Product Version Raw CPE
libssh libssh >= 0.9.1, <= 0.9.6 cpe:2.3:a:libssh:libssh:*:*:*:*:*:*:*:*
libssh libssh >= 0.10.0, <= 0.10.4 cpe:2.3:a:libssh:libssh:*:*:*:*:*:*:*:*
fedoraproject fedora 37 cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:*
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
redhat enterprise_linux 8.0 cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
redhat enterprise_linux 9.0 cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*

References for CVE-2023-1667

cvelogic Threat Intelligence