CVE-2022-3515Network attack vector

Remote code execution via BER length overflow

Published Jan 12, 2023 · Updated Apr 8, 2025

Integer overflow in Libksba before 1.6.2 allows remote attackers to execute arbitrary code through crafted ASN.1 data. The _ksba_ber_read_tl parser adds the encoded header and attacker-declared value lengths without first rejecting size_t wraparound, so an oversized value passes the bound check and overflows a temporary buffer during copying. A consuming application must parse attacker-supplied S/MIME, certificate, or CRL data; successful exploitation executes code in that process.

CVSS severity9.8
Critical
EPSS probability1.65%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in Libksba before 1.6.2 allows remote attackers to execute arbitrary code through crafted ASN.1 data. The _ksba_ber_read_tl parser adds the encoded header and attacker-declared value lengths without first rejecting size_t wraparound, so an oversized value passes the bound check and overflows a temporary buffer during copying. A consuming application must parse attacker-supplied S/MIME, certificate, or CRL data; successful exploitation executes code in that process.

The record

CVE
CVE-2022-3515
Published
Jan 12, 2023
Updated
Apr 8, 2025
Vendor
g10 Code GmbH
Product
Libksba
Classifications
CWE-190, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Fixed in libksba v1.6.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

g10 Code GmbH · Libksbaversion=Fixed in libksba v1.6.2

Published CVSS scores

8.1Trend Micro Zero Day InitiativeCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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