CVE-2020-28759: The serializer module in OAID Tengine lite-v1.0 has a Buffer Overflow and crash

Routine

MEDIUM 5.5DOWNGRADE

CVE-2020-28759 is a medium-severity flaw (CVSS 5.5) affecting tengine. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The serializer module in OAID Tengine lite-v1.0 has a Buffer Overflow and crash. NOTE: another person has stated "I don't think there is an proof of overflow so far.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-120
Published	2020-12-26
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: tengine project

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

Am I affected?

Timeline

2020-12-26 20:15 UTCPublished CVE record published
2026-06-17 03:10 UTCUpdated Record last modified

tengine project tengine DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison tengine sudo apt install tengine=<VERSION_BEFORE_1.0> sudo apt-mark hold tengine

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

dnf --showduplicates list tengine sudo dnf downgrade tengine-<VERSION_BEFORE_1.0> sudo dnf versionlock add tengine

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-2020-28759?

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

Is CVE-2020-28759 being exploited?

CVE-2020-28759 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-2020-28759 affect?

CVE-2020-28759 affects tengine. Severity is medium (CVSS 5.5). The serializer module in OAID Tengine lite-v1.0 has a Buffer Overflow and crash. NOTE: another person has stated "I don't think there is an proof of overflow so far.

How urgent is CVE-2020-28759?

Priority 38/100. Public exploit reference

Related CVEs

CVE-2020-21699 HIGH 7.5 DOWNGRADE The web server Tengine 2.2.2 developed in the Nginx version from 0.5.6 thru 1.13.2 is vulnerable to an integer

References

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