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NVD / CVE Program· CNA mitre

CVE-2021-46848: GNU Libtasn1 before 4.19.0 has an ETYPE_OK off-by-one array size check that affects asn1_encode_simple_der.

CriticalCVSS 9.1 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 37/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 2.8% (FIRST EPSS); higher than 86.8% of all records.
  • 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.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: libtasn1 (AlmaLinux:8) 4.13-4.el8_7; libtasn1-devel (AlmaLinux:8) 4.13-4.el8_7; libtasn1-tools (AlmaLinux:8) 4.13-4.el8_7.

Low priority for now. Upgrade to libtasn1 (AlmaLinux:8) 4.13-4.el8_7; libtasn1-devel (AlmaLinux:8) 4.13-4.el8_7; libtasn1-tools (AlmaLinux:8) 4.13-4.el8_7 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Published
Oct 24, 2022
Updated
Oct 14, 2026
EPSS
2.8% · 86th percentile

Report tools

JSON

Action score

37

Monitor

Low priority for now.

CVSS
36 / 40 · 9.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 2.8%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
9.1
CNA · mitre
9.1
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2021-46848

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
gnulibtasn1
fedoraprojectfedora
debiandebian linux

Affected versions

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

  • debian debian linux10.0
  • fedoraproject fedora35
  • fedoraproject fedora36
  • fedoraproject fedora37
  • gnu libtasn1before 4.19.0

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:8libtasn1before 4.13-4.el8_74.13-4.el8_7
AlmaLinux:8libtasn1-develbefore 4.13-4.el8_74.13-4.el8_7
AlmaLinux:8libtasn1-toolsbefore 4.13-4.el8_74.13-4.el8_7
AlmaLinux:9libtasn1before 4.16.0-8.el9_14.16.0-8.el9_1
AlmaLinux:9libtasn1-develbefore 4.16.0-8.el9_14.16.0-8.el9_1
AlmaLinux:9libtasn1-toolsbefore 4.16.0-8.el9_14.16.0-8.el9_1
Alpine:v3.14libtasn1before 4.17.0-r14.17.0-r1
Alpine:v3.15libtasn1before 4.18.0-r14.18.0-r1
Alpine:v3.17libtasn1before 4.19-r04.19-r0
Debian:10libtasn1-6before 4.13-3+deb10u14.13-3+deb10u1
Debian:12libtasn1-6before 4.19.0-24.19.0-2
openSUSE:Leap Micro 5.2libtasn1before 4.13-150000.4.8.14.13-150000.4.8.1
Red Hat:enterprise_linux:8::appstreamlibtasn1-debuginfobefore 0:4.13-4.el8_70:4.13-4.el8_7
Red Hat:enterprise_linux:8::appstreamlibtasn1-debugsourcebefore 0:4.13-4.el8_70:4.13-4.el8_7
Red Hat:enterprise_linux:8::appstreamlibtasn1-develbefore 0:4.13-4.el8_70:4.13-4.el8_7
Red Hat:enterprise_linux:8::appstreamlibtasn1-toolsbefore 0:4.13-4.el8_70:4.13-4.el8_7
Red Hat:enterprise_linux:8::appstreamlibtasn1-tools-debuginfobefore 0:4.13-4.el8_70:4.13-4.el8_7
Red Hat:enterprise_linux:8::baseoslibtasn1before 0:4.13-4.el8_70:4.13-4.el8_7
Red Hat:enterprise_linux:9::appstreamlibtasn1-debuginfobefore 0:4.16.0-8.el9_10:4.16.0-8.el9_1
Red Hat:enterprise_linux:9::appstreamlibtasn1-debugsourcebefore 0:4.16.0-8.el9_10:4.16.0-8.el9_1
Red Hat:enterprise_linux:9::appstreamlibtasn1-develbefore 0:4.16.0-8.el9_10:4.16.0-8.el9_1
Red Hat:enterprise_linux:9::appstreamlibtasn1-toolsbefore 0:4.16.0-8.el9_10:4.16.0-8.el9_1
Red Hat:enterprise_linux:9::appstreamlibtasn1-tools-debuginfobefore 0:4.16.0-8.el9_10:4.16.0-8.el9_1
Red Hat:enterprise_linux:9::baseoslibtasn1before 0:4.16.0-8.el9_10:4.16.0-8.el9_1

+11

Same product

gnu: all records

Other highest-scoring records for the same primary product.

  • 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…
    37Monitor
  • 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…
    32Monitor
  • CVE-2018-6003An issue was discovered in the _asn1_decode_simple_ber function in decoding.c in GNU Libtasn1 before 4.13.
    31Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2017-10790Jul 1, 2017 · The _asn1_check_identifier function in GNU Libtasn1 through 4.12 causes a NULL pointer dereference and crash when reading crafted input…
    31Monitor
  • ← EarlierCVE-2018-1000654Aug 20, 2018 · GNU Libtasn1-4.13 libtasn1-4.13 version libtasn1-4.13, libtasn1-4.12 contains a DoS, specifically CPU usage will reach 100% when running…
    23Monitor
  • Later →CVE-2025-13151Jan 7, 2026 · Stack-based buffer overflow in libtasn1 version: v4.20.0.
    30Monitor

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
almalinux:libtasn14.13-4.el8_7 · AlmaLinux:8Package registry (OSV)
almalinux:libtasn1-devel4.13-4.el8_7 · AlmaLinux:8Package registry (OSV)
almalinux:libtasn1-tools4.13-4.el8_7 · AlmaLinux:8Package registry (OSV)
alpine:libtasn14.17.0-r1 · Alpine:v3.14Package registry (OSV)
debian:libtasn1-64.19.0-2 · Debian:12Package registry (OSV)
opensuse:libtasn14.13-150000.4.8.1 · openSUSE:Leap Micro 5.2Package registry (OSV)
red hat:libtasn10:4.13-4.el8_7 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:libtasn1-debuginfo0:4.13-4.el8_7 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libtasn1-debugsource0:4.13-4.el8_7 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libtasn1-devel0:4.13-4.el8_7 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libtasn1-tools0:4.13-4.el8_7 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libtasn1-tools-debuginfo0:4.13-4.el8_7 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
rocky linux:libtasn10:4.13-4.el8_7 · Rocky Linux:8Package registry (OSV)
suse:libtasn14.13-150000.4.8.1 · SUSE:Linux Enterprise Micro 5.3Package 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.

Patch and commit links

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

Not on record for this CVE: EPSS history · researcher credit · variant or chain candidate · public bounty program.

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
high · data can be read
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
High
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-193 · Off-by-one Error

CVSS vector

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

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (8 more)

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

All records