Is CVE-2021-35940 in the CISA KEV catalog?

No. CVE-2021-35940 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-35940?

CVE-2021-35940 has a CVSS v3 base score of 7.1 (HIGH).

What is the EPSS score for CVE-2021-35940?

CVE-2021-35940 has an EPSS score of 1.19% (64th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-35940?

Upgrade apr on debian 11 to 1.7.0-6+deb11u1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2021-35940

HIGH

7.1

CVSS v3

NVD

Description

An out-of-bounds array read in the apr_time_exp*() functions was fixed in the Apache Portable Runtime 1.6.3 release (CVE-2017-12613). The fix for this issue was not carried forward to the APR 1.7.x branch, and hence version 1.7.0 regressed compared to 1.6.3 and is vulnerable to the same issue.

CWE-125Out-of-bounds Read

How to fix

Remediation Available

aprDebian

Fixed in:1.7.0-6+deb11u1CVE-2021-35940

Fixed in:1.7.0-7CVE-2021-35940

aprUbuntu

Fixed in:1.5.0-1ubuntu0.1~esm1USN-5056-1

Fixed in:1.5.2-3ubuntu0.1~esm1USN-5056-1

libapr1Ubuntu

Fixed in:1.5.0-1ubuntu0.1~esm1USN-5056-1

Fixed in:1.5.2-3ubuntu0.1~esm1USN-5056-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

1.19%probability of exploitation in 30 days

64thpercentile

Moderate risk: more likely to be exploited than 64% of all known CVEs.

References

Patch2

Vendor Advisory2

Third-Party Advisory1

openwall.com

Other references11

Related Vulnerabilities

Other CWE-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0160	High	7.5	100%	KEV	Fix
CVE-2025-5777	High	7.5	100%	KEV + Ransom	Fix
CVE-2021-4034	High	7.8	95%	KEV	Fix
CVE-2023-21769	High	7.5	92%	-	Fix
CVE-2023-49285	High	8.6	89%	-	Fix
CVE-2020-8794	Critical	9.8	89%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.