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CVE-2018-6003· NVD / CVE Program· CNA mitre

An issue was discovered in the _asn1_decode_simple_ber function in decoding.c in GNU Libtasn1 before 4.13.

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.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Jan 22, 2018
Updated
Jun 16, 2026
EPSS
2.8% · 86th percentile
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Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 2.8%

Affected systems

VendorProduct
gnulibtasn1
debiandebian linux
fedoraprojectfedora

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux9.0
  • fedoraproject fedora26
  • fedoraproject fedora27
  • gnu libtasn1up to 4.12 inclusive

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.10libtasn1before 4.13-r04.13-r0
Alpine:v3.4libtasn1before 4.8-r34.8-r3
Alpine:v3.5libtasn1before 4.9-r34.9-r3
Alpine:v3.6libtasn1before 4.10-r34.10-r3
Alpine:v3.7libtasn1before 4.12-r34.12-r3
Debian:12libtasn1-6before 4.13-24.13-2
Debian:9libtasn1-6before 4.10-1.1+deb9u14.10-1.1+deb9u1
openSUSE:Tumbleweedlibtasn1before 4.17.0-1.24.17.0-1.2
SUSE:Linux Enterprise Desktop 12 SP3libtasn1before 4.9-3.5.14.9-3.5.1

Same product

gnu: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-46848GNU Libtasn1 before 4.19.0 has an ETYPE_OK off-by-one array size check that affects asn1_encode_simple_der.
    37Monitor
  • CVE-2017-6891Two errors in the "asn1_find_node()" function (lib/parser_aux.c) within GnuTLS libtasn1 version 4.10 can be exploited to cause a stacked-bas
    37Monitor
  • CVE-2017-10790The _asn1_check_identifier function in GNU Libtasn1 through 4.12 causes a NULL pointer dereference and crash when reading crafted input that
    31Monitor
  • CVE-2016-4008The _asn1_extract_der_octet function in lib/decoding.c in GNU Libtasn1 before 4.8, when used without the ASN1_DECODE_FLAG_STRICT_DER flag, a
    31Monitor
  • CVE-2025-13151Stack-based buffer overflow in libtasn1 version: v4.20.0.
    30Monitor
  • CVE-2015-3622The _asn1_extract_der_octet function in lib/decoding.c in GNU Libtasn1 before 4.5 allows remote attackers to cause a denial of service (out-
    27Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:libtasn14.13-r0 · Alpine:v3.10Package registry (OSV)
debian:libtasn1-64.13-2 · Debian:12Package registry (OSV)
opensuse:libtasn14.17.0-1.2 · openSUSE:TumbleweedPackage registry (OSV)
suse:libtasn14.9-3.5.1 · SUSE:Linux Enterprise Desktop 12 SP3Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-674 · Uncontrolled Recursion

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Noroxi analysis

No Noroxi analysis for this record yet

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Change log

  1. Fix✗ → ✓

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References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records