CVE-2018-6003

An issue was discovered in the _asn1_decode_simple_ber function in decoding.c in GNU Libtasn1 before 4.13. Unlimited recursion in the BER decoder leads to stack exhaustion and DoS.

Published: 2018-01-22 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-6003 is rated Moderate Risk (61/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.55%). 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-2018-6003

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 2026-05-27 1.58% 2.55% +0.96%
2 2025-11-21 2.55% 1.58% -0.96%
3 2025-11-18 — 2.55% —

Full EPSS history (15 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-6003

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/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:N)
No account or special rights needed—anonymous or random user is enough.
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.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2018-6003

OS Trackers for CVE-2018-6003

vendor priority summary link
alpine high CVE-2018-6003: 1 source package rows (libtasn1); 15 state rows across 10 repos (3.10-main, 3.11-main, 3.12-main, 3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 10, open 5. https://security.alpinelinux.org/vuln/CVE-2018-6003
debian not yet assigned CVE-2018-6003 not yet assigned priority: Debian including 1 source packages (libtasn1-6), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2018-6003
redhat medium — https://access.redhat.com/security/cve/CVE-2018-6003
suse high CVE-2018-6003 severity important: SUSE including 299 source package names (0.9.1:libtasn1-4.9-3.5.1, 0.9.1:libtasn1-6-4.9-3.5.1, …), 457 product×package rows across 96 product lines (Container caasp/v4/default-http-backend, Container caasp/v4/dnsmasq-nanny, … (96 product lines)): Fixed 242, Known Affected 157, Known Not Affected 58. https://www.suse.com/security/cve/CVE-2018-6003/
ubuntu medium CVE-2018-6003 medium priority: Ubuntu including 2 source packages (libtasn1-3, libtasn1-6), 8 status rows across 4 suites (artful, trusty, upstream, xenial): DNE 3, released 3, needs-triage 1, not-affected 1. https://ubuntu.com/security/CVE-2018-6003

Affected software / configurations for CVE-2018-6003

Vendor Product Version Raw CPE
gnu libtasn1 <= 4.12 cpe:2.3:a:gnu:libtasn1:*:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
fedoraproject fedora 26 cpe:2.3:o:fedoraproject:fedora:26:*:*:*:*:*:*:*
fedoraproject fedora 27 cpe:2.3:o:fedoraproject:fedora:27:*:*:*:*:*:*:*

References for CVE-2018-6003

cvelogic Threat Intelligence