CVE-2020-7774: The package y18n before 3.2.2, 4.0.1 and 5.0.5, is vulnerable to Prototype Pollution.

Q: How do I fix CVE-2020-7774?

y18n: upgrade to 3.2.2, 5.0.5; graalvm: downgrade or apply the listed mitigation; sinec infrastructure network services: upgrade to 1.0.1.1. Exact commands for each OS are on this page.

Q: Is CVE-2020-7774 being exploited?

CVE-2020-7774 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-2020-7774 affect?

CVE-2020-7774 affects y18n, graalvm, sinec infrastructure network services. Severity is high (CVSS 7.3). The package y18n before 3.2.2, 4.0.1 and 5.0.5, is vulnerable to Prototype Pollution.

Q: How urgent is CVE-2020-7774?

Priority 60/100. High severity; EPSS top 1%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.3REMOTEUPGRADEDOWNGRADEUPGRADE

CVE-2020-7774 is a high-severity flaw (CVSS 7.3) affecting y18n, graalvm, sinec infrastructure network services. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The package y18n before 3.2.2, 4.0.1 and 5.0.5, is vulnerable to Prototype Pollution.

Why this priority

High severity
EPSS top 1%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.3 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	69.6% (top 1%)
CISA exploited list	No
Weakness	CWE-1321
Published	2020-11-17
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: oracle · siemens · y18n project

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

Am I affected?

Timeline

2020-11-17 13:15 UTCPublished CVE record published
2026-06-17 03:25 UTCUpdated Record last modified

y18n project y18n UPGRADE

Affected: < 3.2.2 · >= 5.0.0 and < 5.0.5 · 4.0.0

Fixed in: 3.2.2, 5.0.5

Safe to downgrade to: a release before 4.0.0

1. Check installed version

npm ls y18n

2. UPGRADE to 3.2.2

npm install y18n@">=3.2.2"

3. If no update is available yet, DOWNGRADE to a release before 4.0.0

npm view y18n versions npm install y18n@"<4.0.0"

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.

oracle graalvm DOWNGRADE

Affected: 19.3.5 · 20.3.1.2 · 21.0.0.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 19.3.5

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 19.3.5 (Debian / Ubuntu)

apt-cache madison graalvm sudo apt install graalvm=<VERSION_BEFORE_19.3.5> sudo apt-mark hold graalvm

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

dnf --showduplicates list graalvm sudo dnf downgrade graalvm-<VERSION_BEFORE_19.3.5> sudo dnf versionlock add graalvm

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.

siemens sinec infrastructure network services UPGRADE

Affected: < 1.0.1.1

Fixed in: 1.0.1.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy sinec-infrastructure-network-services || rpm -q sinec-infrastructure-network-services || sinec-infrastructure-network-services --version

2. UPGRADE to 1.0.1.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade sinec-infrastructure-network-services

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade sinec-infrastructure-network-services

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-2020-7774?

y18n: upgrade to 3.2.2, 5.0.5; graalvm: downgrade or apply the listed mitigation; sinec infrastructure network services: upgrade to 1.0.1.1. Exact commands for each OS are on this page.

Is CVE-2020-7774 being exploited?

CVE-2020-7774 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-2020-7774 affect?

CVE-2020-7774 affects y18n, graalvm, sinec infrastructure network services. Severity is high (CVSS 7.3). The package y18n before 3.2.2, 4.0.1 and 5.0.5, is vulnerable to Prototype Pollution.

How urgent is CVE-2020-7774?

Priority 60/100. High severity; EPSS top 1%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Siemens vulnerabilities

References

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