CVE-2020-20658: Buffer overflow vulnerability in fcovatti libiec_iccp_mod v1.5, allows attackers to cause a denail of service

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HIGH 7.5REMOTEDOWNGRADE

CVE-2020-20658 is a high-severity flaw (CVSS 7.5) affecting libiec iccp mod. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow vulnerability in fcovatti libiec_iccp_mod v1.5, allows attackers to cause a denail of service when trying to calloc an unexpectiedly large space.

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 37%)
CISA exploited list	No
Weakness	CWE-120
Published	2021-11-02
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: libiec iccp mod project

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

Am I affected?

Timeline

2021-11-02 18:15 UTCPublished CVE record published
2026-06-17 03:03 UTCUpdated Record last modified

libiec iccp mod project libiec iccp mod DOWNGRADE

Affected: 1.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.5

1. Check installed version

apt-cache policy libiec-iccp-mod || rpm -q libiec-iccp-mod || libiec-iccp-mod --version

2. No fixed release: DOWNGRADE to a release before 1.5 (Debian / Ubuntu)

apt-cache madison libiec-iccp-mod sudo apt install libiec-iccp-mod=<VERSION_BEFORE_1.5> sudo apt-mark hold libiec-iccp-mod

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list libiec-iccp-mod sudo dnf downgrade libiec-iccp-mod-<VERSION_BEFORE_1.5> sudo dnf versionlock add libiec-iccp-mod

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2020-20658?

libiec iccp mod: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-20658 being exploited?

CVE-2020-20658 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-2020-20658 affect?

CVE-2020-20658 affects libiec iccp mod. Severity is high (CVSS 7.5). Buffer overflow vulnerability in fcovatti libiec_iccp_mod v1.5, allows attackers to cause a denail of service when trying to calloc an unexpectiedly large space.

How urgent is CVE-2020-20658?

Priority 47/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2020-20664 MEDIUM 6.5 DOWNGRADE libiec_iccp_mod v1.5 contains a segmentation violation in the component server_example1.c.
CVE-2020-20663 MEDIUM 6.5 DOWNGRADE libiec_iccp_mod v1.5 contains a heap-buffer-overflow in the component mms_client_connection.c.
CVE-2020-20662 MEDIUM 6.5 DOWNGRADE libiec_iccp_mod v1.5 contains a heap-buffer-overflow in the component mms_client_example1.c.
CVE-2020-20657 HIGH 7.5 DOWNGRADE Buffer overflow vulnerability in fcovatti libiec_iccp_mod v1.5, allows attackers to cause a denial of service
CVE-2020-20490 HIGH 7.5 DOWNGRADE A heap buffer-overflow in the client_example1.c component of libiec_iccp_mod v1.5 leads to a denial of service

References

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