CVE•Published 2021-07-13•Modified 2026-10-08•1 article on news•5 live references•NVD data
CVE-2021-35517Apache · Commons_compress
Vulnerability data via NVD (ingested)
CVSS v3.1
7.5
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS percentile
96
Exploit Prediction Scoring System · top 4% of all CVEs
Weaknesses (CWE)
Description
When reading a specially crafted TAR archive, Compress can be made to allocate large amounts of memory that finally leads to an out of memory error even for very small inputs. This could be used to mount a denial of service attack against services that use Compress' tar package.
Timeline
Published 2021-07-13
Modified 2026-10-08
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2021-35517Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Apache Commons Compress"All exposed Apache Commons Compress instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Commons Compress"HTTP body or banner mentions "Commons Compress" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2021-35517Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2021-35517Censys host search filtered to this CVE id.
grep.app
CVE-2021-35517Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2021-35517GitHub code search for direct mentions.
Google dork
"CVE-2021-35517" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.