CVE-2020-17363: USVN (aka User-friendly SVN) before 1.0.9 allows remote code execution via shell metacharacters in the number_

Q: How do I fix CVE-2020-17363?

usvn: upgrade to 1.0.9. Exact commands for each OS are on this page.

Q: Is CVE-2020-17363 being exploited?

CVE-2020-17363 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-2020-17363 affect?

CVE-2020-17363 affects usvn. Severity is critical (CVSS 9.9). USVN (aka User-friendly SVN) before 1.0.9 allows remote code execution via shell metacharacters in the number_start or number_end parameter to LastHundredRequest (aka lasthundredrequestAction) in the Timeline module. NOTE: this may overlap

Q: How urgent is CVE-2020-17363?

Priority 63/100. Critical severity; EPSS top 8%: very likely to be exploited; Public exploit reference

This week

CRITICAL 9.9UPGRADE

CVE-2020-17363 is a critical-severity flaw (CVSS 9.9) affecting usvn. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

USVN (aka User-friendly SVN) before 1.0.9 allows remote code execution via shell metacharacters in the number_start or number_end parameter to LastHundredRequest (aka lasthundredrequestAction) in the Timeline module. NOTE: this may overlap CVE-2020-25069.

Why this priority

Critical severity
EPSS top 8%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	9.9 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	4.6% (top 8%)
CISA exploited list	No
Weakness	CWE-78
Published	2020-12-31
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: usvn

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

Am I affected?

Timeline

2020-12-31 02:15 UTCPublished CVE record published
2026-06-17 02:58 UTCUpdated Record last modified

usvn usvn UPGRADE

Affected: < 1.0.9

Fixed in: 1.0.9

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 1.0.9 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade usvn

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-2020-17363?

usvn: upgrade to 1.0.9. Exact commands for each OS are on this page.

Is CVE-2020-17363 being exploited?

CVE-2020-17363 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-2020-17363 affect?

CVE-2020-17363 affects usvn. Severity is critical (CVSS 9.9). USVN (aka User-friendly SVN) before 1.0.9 allows remote code execution via shell metacharacters in the number_start or number_end parameter to LastHundredRequest (aka lasthundredrequestAction) in the Timeline module. NOTE: this may overlap

How urgent is CVE-2020-17363?

Priority 63/100. Critical severity; EPSS top 8%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2020-25070 HIGH 8.8 UPGRADE USVN (aka User-friendly SVN) before 1.0.10 allows CSRF, related to the lack of the SameSite Strict feature.
CVE-2020-25069 CRITICAL 9.8 UPGRADE USVN (aka User-friendly SVN) before 1.0.10 allows attackers to execute arbitrary code in the commit view.
CVE-2018-0695 MEDIUM 6.1 UPGRADE Cross-site scripting vulnerability in User-friendly SVN (USVN) Version 1.0.7 and earlier allows remote attacke

References

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