CVE-2021-32700: Ballerina is an open source programming language and platform for cloud application programmers

This month

CRITICAL 9.1REMOTEUPGRADEDOWNGRADE

CVE-2021-32700 is a critical-severity flaw (CVSS 9.1) affecting ballerina, swan lake. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Ballerina is an open source programming language and platform for cloud application programmers. Ballerina versions 1.2.x and SL releases up to alpha 3 have a potential for a supply chain attack via MiTM against users. Http connections did not make use of TLS and certificate checking was ignored. The vulnerability allows an attacker to substitute or modify packages retrieved from BC thus allowing to inject malicious code into ballerina executable

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-306
Published	2021-06-22
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: ballerina

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

Am I affected?

Timeline

2021-06-22 20:15 UTCPublished CVE record published
2026-06-17 03:53 UTCUpdated Record last modified

ballerina ballerina UPGRADE

Affected: < 1.2.14

Fixed in: 1.2.14

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 1.2.14 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ballerina

Note

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

ballerina swan lake DOWNGRADE

Affected: alpha1 · alpha2 · alpha3

Fixed in: no fixed release known

Safe to downgrade to: a release before alpha1

1. Check installed version

apt-cache policy swan-lake || rpm -q swan-lake || swan-lake --version

2. No fixed release: DOWNGRADE to a release before alpha1 (Debian / Ubuntu)

apt-cache madison swan-lake sudo apt install swan-lake=<VERSION_BEFORE_alpha1> sudo apt-mark hold swan-lake

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

dnf --showduplicates list swan-lake sudo dnf downgrade swan-lake-<VERSION_BEFORE_alpha1> sudo dnf versionlock add swan-lake

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-2021-32700?

ballerina: upgrade to 1.2.14; swan lake: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-32700 being exploited?

CVE-2021-32700 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-2021-32700 affect?

CVE-2021-32700 affects ballerina, swan lake. Severity is critical (CVSS 9.1). Ballerina is an open source programming language and platform for cloud application programmers. Ballerina versions 1.2.x and SL releases up to alpha 3 have a potential for a supply chain attack via MiTM against users. Http connections did

How urgent is CVE-2021-32700?

Priority 49/100. Critical severity; Remotely exploitable, no login, no user action

References

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