CVE-2021-27290: ssri 5.2.2-8.0.0, fixed in 8.0.1, processes SRIs using a regular expression which is vulnerable to a denial of

Q: How do I fix CVE-2021-27290?

ssri: upgrade to 6.0.2, 8.0.1; 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-2021-27290 being exploited?

CVE-2021-27290 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-2021-27290 affect?

CVE-2021-27290 affects ssri, graalvm, sinec infrastructure network services. Severity is high (CVSS 7.5). ssri 5.2.2-8.0.0, fixed in 8.0.1, processes SRIs using a regular expression which is vulnerable to a denial of service. Malicious SRIs could take an extremely long time to process, leading to denial of service. This issue only affects consu

Q: How urgent is CVE-2021-27290?

Priority 59/100. High severity; EPSS top 8%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADEDOWNGRADEUPGRADE

CVE-2021-27290 is a high-severity flaw (CVSS 7.5) affecting ssri, graalvm, sinec infrastructure network services. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ssri 5.2.2-8.0.0, fixed in 8.0.1, processes SRIs using a regular expression which is vulnerable to a denial of service. Malicious SRIs could take an extremely long time to process, leading to denial of service. This issue only affects consumers using the strict option.

Why this priority

High severity
EPSS top 8%: 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	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	4.7% (top 8%)
CISA exploited list	No
Published	2021-03-12
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: oracle · siemens · ssri project

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

Am I affected?

Timeline

2021-03-12 22:15 UTCPublished CVE record published
2026-06-17 03:44 UTCUpdated Record last modified

ssri project ssri UPGRADE

Affected: >= 5.2.2 and < 6.0.2 · >= 7.0.0 and < 8.0.1

Fixed in: 6.0.2, 8.0.1

Safe to downgrade to: a release before 5.2.2

1. Check installed version

npm ls ssri

2. UPGRADE to 6.0.2

npm install ssri@">=6.0.2"

3. If no update is available yet, DOWNGRADE to a release before 5.2.2

npm view ssri versions npm install ssri@"<5.2.2"

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: 20.3.3 · 21.2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 20.3.3

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 20.3.3 (Debian / Ubuntu)

apt-cache madison graalvm sudo apt install graalvm=<VERSION_BEFORE_20.3.3> sudo apt-mark hold graalvm

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

dnf --showduplicates list graalvm sudo dnf downgrade graalvm-<VERSION_BEFORE_20.3.3> 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-2021-27290?

ssri: upgrade to 6.0.2, 8.0.1; 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-2021-27290 being exploited?

CVE-2021-27290 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-2021-27290 affect?

CVE-2021-27290 affects ssri, graalvm, sinec infrastructure network services. Severity is high (CVSS 7.5). ssri 5.2.2-8.0.0, fixed in 8.0.1, processes SRIs using a regular expression which is vulnerable to a denial of service. Malicious SRIs could take an extremely long time to process, leading to denial of service. This issue only affects consu

How urgent is CVE-2021-27290?

Priority 59/100. High severity; EPSS top 8%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Siemens vulnerabilities

Related CVEs

CVE-2018-7651 MEDIUM 5.9 UPGRADE index.js in the ssri module before 5.2.2 for Node.js is prone to a regular expression denial of service vulner

References

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