CVE-2021-35515

Commons Compress vulnerability

CVSS

7.5

EPSS

11.6%

EPSS pct

96th

Exploited

No known

When reading a specially crafted 7Z archive, the construction of the list of codecs that decompress an entry can result in an infinite loop. This could be used to mount a denial of service attack against services that use Compress' sevenz package.

Affected vendor

Apache

Affected product

Commons Compress

CVSS vector

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

Weakness type (CWE)

CWE-834 — Excessive Iteration
CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)

Published

2021-07-13

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to availability.

Its EPSS score of 11.6% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 96% of all scored CVEs.

Check your external exposure to CVE-2021-35515

Confirm whether Apache Commons Compress is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2021-35515.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-35515

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