CVE-2021-46848Public exploitNetwork attack vector

Information disclosure via off-by-one bounds check

Published Oct 24, 2022 · Updated May 7, 2025

Out-of-bounds read in GNU Libtasn1 before 4.19.0 allows attackers to read adjacent memory or crash a process via an invalid ETYPE value. ETYPE_OK accepts an etype equal to _asn1_tags_size, then dereferences that one-past-the-end index in the global _asn1_tags table. Reachability depends on a consuming application exposing control of the ETYPE argument; the upstream reproducer demonstrates an eight-byte global out-of-bounds read.

CVSS severity9.1
Critical
EPSS probability2.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in GNU Libtasn1 before 4.19.0 allows attackers to read adjacent memory or crash a process via an invalid ETYPE value. ETYPE_OK accepts an etype equal to _asn1_tags_size, then dereferences that one-past-the-end index in the global _asn1_tags table. Reachability depends on a consuming application exposing control of the ETYPE argument; the upstream reproducer demonstrates an eight-byte global out-of-bounds read.

The record

CVE
CVE-2021-46848
Published
Oct 24, 2022
Updated
May 7, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-193
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 24, 2022CVE publishedPublication date reported by the CVE source.
  2. May 7, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-193Off-by-one Error

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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