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NVD / CVE Program· CNA redhat

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…

HighCVSS 7.5 · v3.0—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 39/100)

  • 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: 29.2% (FIRST EPSS); higher than 98.2% 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.
  • Fixed version: openssl (Alpine:v3.2) 1.0.2h-r0; openssl (Debian:12) 1.0.2h-1; openssl (Debian:7) 1.0.1e-2+deb7u21.

Low priority for now. Upgrade to openssl (Alpine:v3.2) 1.0.2h-r0; openssl (Debian:12) 1.0.2h-1; openssl (Debian:7) 1.0.1e-2+deb7u21 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

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.

Published
May 4, 2016
Updated
Jun 16, 2026
EPSS
29.2% · 98th percentile

Report tools

JSON

Action score

39

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
9 / 30 · 29.2%

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

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  • 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
opensslopenssl
redhatenterprise linux desktop
redhatenterprise linux hpc node
redhatenterprise linux hpc node eus
redhatenterprise linux server
redhatenterprise linux server aus
redhatenterprise linux server eus
redhatenterprise linux workstation

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Affected versions

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

  • openssl opensslup to 1.0.1s inclusive
  • openssl openssl1.0.2
  • openssl openssl1.0.2a
  • openssl openssl1.0.2b
  • openssl openssl1.0.2c
  • openssl openssl1.0.2d
  • openssl openssl1.0.2e
  • openssl openssl1.0.2f
+12 more rows
  • openssl openssl1.0.2g
  • redhat enterprise linux desktop6.0
  • redhat enterprise linux desktop7.0
  • redhat enterprise linux hpc node6.0
  • redhat enterprise linux hpc node7.0
  • redhat enterprise linux hpc node eus7.2
  • redhat enterprise linux server6.0
  • redhat enterprise linux server7.0
  • redhat enterprise linux server aus7.2
  • redhat enterprise linux server eus7.2
  • redhat enterprise linux workstation6.0
  • redhat enterprise linux workstation7.0

Package-level exposure

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

EcosystemPackageAffected rangeFix
Alpine:v3.2opensslbefore 1.0.2h-r01.0.2h-r0
Debian:12opensslbefore 1.0.2h-11.0.2h-1
Debian:7opensslbefore 1.0.1e-2+deb7u211.0.1e-2+deb7u21
Debian:8opensslbefore 1.0.1k-3+deb8u51.0.1k-3+deb8u5
Red Hat:enterprise_linux:6::clientopensslbefore 0:1.0.1e-48.el6_8.10:1.0.1e-48.el6_8.1
Red Hat:enterprise_linux:6::clientopenssl-debuginfobefore 0:1.0.1e-48.el6_8.10:1.0.1e-48.el6_8.1
Red Hat:enterprise_linux:6::clientopenssl-develbefore 0:1.0.1e-48.el6_8.10:1.0.1e-48.el6_8.1
Red Hat:enterprise_linux:6::clientopenssl-perlbefore 0:1.0.1e-48.el6_8.10:1.0.1e-48.el6_8.1
Red Hat:enterprise_linux:6::clientopenssl-staticbefore 0:1.0.1e-48.el6_8.10:1.0.1e-48.el6_8.1
Red Hat:enterprise_linux:7::clientopensslbefore 1:1.0.1e-51.el7_2.51:1.0.1e-51.el7_2.5
Red Hat:enterprise_linux:7::clientopenssl-debuginfobefore 1:1.0.1e-51.el7_2.51:1.0.1e-51.el7_2.5
Red Hat:enterprise_linux:7::clientopenssl-develbefore 1:1.0.1e-51.el7_2.51:1.0.1e-51.el7_2.5
Red Hat:enterprise_linux:7::clientopenssl-libsbefore 1:1.0.1e-51.el7_2.51:1.0.1e-51.el7_2.5
Red Hat:enterprise_linux:7::clientopenssl-perlbefore 1:1.0.1e-51.el7_2.51:1.0.1e-51.el7_2.5
Red Hat:enterprise_linux:7::clientopenssl-staticbefore 1:1.0.1e-51.el7_2.51:1.0.1e-51.el7_2.5
Red Hat:rhel_eus:6.7::computenodeopensslbefore 0:1.0.1e-42.el6_7.50:1.0.1e-42.el6_7.5
Red Hat:rhel_eus:6.7::computenodeopenssl-debuginfobefore 0:1.0.1e-42.el6_7.50:1.0.1e-42.el6_7.5
Red Hat:rhel_eus:6.7::computenodeopenssl-develbefore 0:1.0.1e-42.el6_7.50:1.0.1e-42.el6_7.5
Red Hat:rhel_eus:6.7::computenodeopenssl-perlbefore 0:1.0.1e-42.el6_7.50:1.0.1e-42.el6_7.5
Red Hat:rhel_eus:6.7::computenodeopenssl-staticbefore 0:1.0.1e-42.el6_7.50:1.0.1e-42.el6_7.5
SUSE:Linux Enterprise Desktop 12compat-openssl098before 0.9.8j-97.10.9.8j-97.1
SUSE:Linux Enterprise Desktop 12opensslbefore 1.0.1i-27.16.11.0.1i-27.16.1
SUSE:Linux Enterprise Desktop 12 SP1opensslbefore 1.0.1i-47.11.0.1i-47.1
SUSE:Linux Enterprise Server 11-SECURITYopenssl1before 1.0.1g-0.47.11.0.1g-0.47.1

+2

Same product

openssl: all records

Other highest-scoring records for the same primary product.

  • CVE-2014-0160The (1) TLS and (2) DTLS implementations in OpenSSL 1.0.1 before 1.0.1g do not properly handle Heartbeat Extension packets, which allows…KEV
    90Now
  • CVE-2021-3711SM2 Decryption Buffer Overflow
    65This week
  • CVE-2003-0545Double free vulnerability in OpenSSL 0.9.7 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code…
    65This week

Published before and after this one in the same product

  • ← EarlierCVE-2016-2107May 4, 2016 · The AES-NI implementation in OpenSSL before 1.0.1t and 1.0.2 before 1.0.2h does not consider memory allocation during a certain padding…
    50Plan
  • ← EarlierCVE-2016-2108May 4, 2016 · The ASN.1 implementation in OpenSSL before 1.0.1o and 1.0.2 before 1.0.2c allows remote attackers to execute arbitrary code or cause a…
    62This week
  • Later →CVE-2016-2176May 4, 2016 · The X509_NAME_oneline function in crypto/x509/x509_obj.c in OpenSSL before 1.0.1t and 1.0.2 before 1.0.2h allows remote attackers to obtain…
    39Monitor

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:openssl1.0.2h-r0 · Alpine:v3.2Package registry (OSV)
debian:openssl1.0.2h-1 · Debian:12Package registry (OSV)
red hat:openssl1:1.0.1e-51.el7_2.5 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:openssl-debuginfo1:1.0.1e-51.el7_2.5 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:openssl-devel1:1.0.1e-51.el7_2.5 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:openssl-libs1:1.0.1e-51.el7_2.5 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:openssl-perl1:1.0.1e-51.el7_2.5 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:openssl-static1:1.0.1e-51.el7_2.5 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
suse:compat-openssl097g0.9.7g-146.22.44.1 · SUSE:Linux Enterprise Server for SAP Applications 11 SP3Package registry (OSV)
suse:compat-openssl0980.9.8j-97.1 · SUSE:Linux Enterprise Desktop 12Package registry (OSV)
suse:openssl1.0.1i-27.16.1 · SUSE:Linux Enterprise Desktop 12Package registry (OSV)
suse:openssl11.0.1g-0.47.1 · SUSE:Linux Enterprise Server 11-SECURITYPackage 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.

Not on record for this CVE: EPSS history · patch commit or PR link · 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
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-399 · Resource Management Errors

CVSS vector

CVSS:3.0/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.

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

References

Show all references (19 more)

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

All records