CVE-2021-27377: An issue was discovered in the yottadb crate before 1.2.0 for Rust

Q: How do I fix CVE-2021-27377?

yottadb: upgrade to 1.2.0. Exact commands for each OS are on this page.

Q: Is CVE-2021-27377 being exploited?

CVE-2021-27377 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-2021-27377 affect?

CVE-2021-27377 affects yottadb. Severity is critical (CVSS 9.8). An issue was discovered in the yottadb crate before 1.2.0 for Rust. For some memory-allocation patterns, ydb_subscript_next_st and ydb_subscript_prev_st have a use-after-free.

Q: How urgent is CVE-2021-27377?

Priority 62/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2021-27377 is a critical-severity flaw (CVSS 9.8) affecting yottadb. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in the yottadb crate before 1.2.0 for Rust. For some memory-allocation patterns, ydb_subscript_next_st and ydb_subscript_prev_st have a use-after-free.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-416
Published	2021-02-18
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: yottadb

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

Am I affected?

Timeline

2021-02-18 04:15 UTCPublished CVE record published
2026-06-17 03:44 UTCUpdated Record last modified

yottadb yottadb UPGRADE

Affected: < 1.2.0

Fixed in: 1.2.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 1.2.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade yottadb

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-2021-27377?

yottadb: upgrade to 1.2.0. Exact commands for each OS are on this page.

Is CVE-2021-27377 being exploited?

CVE-2021-27377 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-2021-27377 affect?

CVE-2021-27377 affects yottadb. Severity is critical (CVSS 9.8). An issue was discovered in the yottadb crate before 1.2.0 for Rust. For some memory-allocation patterns, ydb_subscript_next_st and ydb_subscript_prev_st have a use-after-free.

How urgent is CVE-2021-27377?

Priority 62/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2021-44495 HIGH 7.5 UPGRADE UPGRADE An issue was discovered in YottaDB through r1.32 and V7.0-000 and FIS GT.M through V7.0-000
CVE-2021-44494 HIGH 7.5 UPGRADE UPGRADE An issue was discovered in YottaDB through r1.32 and V7.0-000 and FIS GT.M through V7.0-000
CVE-2021-44493 HIGH 7.5 UPGRADE UPGRADE An issue was discovered in YottaDB through r1.32 and V7.0-000 and FIS GT.M through V7.0-000
CVE-2021-44492 HIGH 7.5 UPGRADE UPGRADE An issue was discovered in YottaDB through r1.32 and V7.0-000 and FIS GT.M through V7.0-000
CVE-2021-44491 HIGH 7.5 UPGRADE UPGRADE An issue was discovered in YottaDB through r1.32 and V7.0-000

References

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