CVE-2020-28371: An issue was discovered in ReadyTalk Avian 1.2.0 before 2020-10-27

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2020-28371 is a critical-severity flaw (CVSS 9.8) affecting avian. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in ReadyTalk Avian 1.2.0 before 2020-10-27. The FileOutputStream.write() method in FileOutputStream.java has a boundary check to prevent out-of-bounds memory read/write operations. However, an integer overflow leads to bypassing this check and achieving the out-of-bounds access. NOTE: This vulnerability only affects products that are no longer supported by the maintainer

Why this priority

Critical severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.7% (top 22%)
CISA exploited list	No
Weakness	CWE-190, CWE-787
Published	2020-11-09
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: readytalk

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

Am I affected?

Timeline

2020-11-09 22:15 UTCPublished CVE record published
2026-06-17 03:10 UTCUpdated Record last modified

readytalk avian DOWNGRADE

Affected: 1.2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.2.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.2.0 (Debian / Ubuntu)

apt-cache madison avian sudo apt install avian=<VERSION_BEFORE_1.2.0> sudo apt-mark hold avian

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

dnf --showduplicates list avian sudo dnf downgrade avian-<VERSION_BEFORE_1.2.0> sudo dnf versionlock add avian

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-2020-28371?

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

Is CVE-2020-28371 being exploited?

CVE-2020-28371 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-2020-28371 affect?

CVE-2020-28371 affects avian. Severity is critical (CVSS 9.8). An issue was discovered in ReadyTalk Avian 1.2.0 before 2020-10-27. The FileOutputStream.write() method in FileOutputStream.java has a boundary check to prevent out-of-bounds memory read/write operations. However, an integer overflow leads

How urgent is CVE-2020-28371?

Priority 59/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Java vulnerabilities

Related CVEs

CVE-2020-17361 MEDIUM 5.5 DOWNGRADE An issue was discovered in ReadyTalk Avian 1.2.0
CVE-2020-17360 HIGH 7.8 DOWNGRADE An issue was discovered in ReadyTalk Avian 1.2.0

References

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