CVE-2016-5080: Integer overflow in the rtxMemHeapAlloc function in asn1rt_a.lib in Objective Systems ASN1C for C/C++ before 7

Q: How do I fix CVE-2016-5080?

asn1c: upgrade to newer than 7.0.1. Exact commands for each OS are on this page.

Q: Is CVE-2016-5080 being exploited?

CVE-2016-5080 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2016-5080 affect?

CVE-2016-5080 affects asn1c. Severity is critical (CVSS 9.8). Integer overflow in the rtxMemHeapAlloc function in asn1rt_a.lib in Objective Systems ASN1C for C/C++ before 7.0.2 allows context-dependent attackers to execute arbitrary code or cause a denial of service (heap-based buffer overflow), on a

Q: How urgent is CVE-2016-5080?

Priority 63/100. Critical severity; EPSS top 4%: very likely to be exploited; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2016-5080 is a critical-severity flaw (CVSS 9.8) affecting asn1c. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Integer overflow in the rtxMemHeapAlloc function in asn1rt_a.lib in Objective Systems ASN1C for C/C++ before 7.0.2 allows context-dependent attackers to execute arbitrary code or cause a denial of service (heap-based buffer overflow), on a system running an application compiled by ASN1C, via crafted ASN.1 data.

Why this priority

Critical severity
EPSS top 4%: very likely to be exploited
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	10.1% (top 4%)
CISA exploited list	No
Published	2016-07-19
Last modified	2026-06-17

Publisher (CNA): CERT/CC · Vendor: objective systems

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2016-07-19 22:59 UTCPublished CVE record published
2026-06-17 00:48 UTCUpdated Record last modified

objective systems asn1c UPGRADE

Affected: <= 7.0.1

Fixed in: newer than 7.0.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy asn1c || rpm -q asn1c || asn1c --version

2. UPGRADE to newer than 7.0.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade asn1c

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade asn1c

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2016-5080?

asn1c: upgrade to newer than 7.0.1. Exact commands for each OS are on this page.

Is CVE-2016-5080 being exploited?

CVE-2016-5080 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2016-5080 affect?

CVE-2016-5080 affects asn1c. Severity is critical (CVSS 9.8). Integer overflow in the rtxMemHeapAlloc function in asn1rt_a.lib in Objective Systems ASN1C for C/C++ before 7.0.2 allows context-dependent attackers to execute arbitrary code or cause a denial of service (heap-based buffer overflow), on a

How urgent is CVE-2016-5080?

Priority 63/100. Critical severity; EPSS top 4%: very likely to be exploited; Remotely exploitable, no login, no user action

Related CVEs

CVE-2020-23911 MEDIUM 5.5 UPGRADE An issue was discovered in asn1c through v0.9.28
CVE-2020-23910 MEDIUM 5.5 UPGRADE Stack-based buffer overflow vulnerability in asn1c through v0.9.28 via function genhash_get in genhash.c.
CVE-2017-12966 MEDIUM 6.5 DOWNGRADE The asn1f_lookup_symbol_impl function in asn1fix_retrieve.c in libasn1fix.a in asn1c 0.9.28 allows remote atta

References

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