NVD / CVE Program· CNA mitre

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

CriticalCVSS 9.8 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 39/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 1.3% (FIRST EPSS); higher than 71.9% of all records.
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
Fixed version: yottadb (crates.io) 1.2.0.

Low priority for now. Upgrade to yottadb (crates.io) 1.2.0 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

Published: Feb 18, 2021
Updated: Jun 16, 2026
EPSS: 1.3% · 71th percentile
CWE: CWE-416

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 39 / 40 · 9.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 1.3%

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Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
yottadb	yottadb	cpe:2.3:a:yottadb:yottadb

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

yottadb yottadbbefore 1.2.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
crates.io	yottadb	from 0.0.0-0 · before 1.2.0	1.2.0
crates.io	yottadb	before 1.2.0	1.2.0

Same product

yottadb: all records

Other highest-scoring records for the same primary product.

CVE-2021-44486An issue was discovered in YottaDB through r1.32 and V7.0-000.
40Plan
CVE-2021-44488An issue was discovered in YottaDB through r1.32 and V7.0-000.
36Monitor
CVE-2021-44493An issue was discovered in YottaDB through r1.32 and V7.0-000 and FIS GT.M through V7.0-000.
31Monitor

Published before and after this one in the same product

Later →CVE-2021-44481Apr 15, 2022 · An issue was discovered in YottaDB through r1.32 and V7.0-000.
30Monitor
Later →CVE-2021-44482Apr 15, 2022 · An issue was discovered in YottaDB through r1.32 and V7.0-000.
30Monitor
Later →CVE-2021-44483Apr 15, 2022 · An issue was discovered in YottaDB through r1.32 and V7.0-000.
30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
crates.io:yottadb	1.2.0	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1free(dev->buf);
2/* ... another thread is still running ... */
3process(dev->buf);

Fixed

1lock(&dev->lock);
2free(dev->buf);
3dev->buf = NULL;
4unlock(&dev->lock);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log (1)

Fix✗ → ✓Sep 28, 2026, 10:48 PM UTC

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