HOMEVULNERABILITIESCVE-2020-5283
LOW

CVE-2020-5283

CWE-80Published: April 3, 2020· Updated: Jun 17, 2026

3.5
CVSS v3.1

Official Description

ViewVC before versions 1.1.28 and 1.2.1 has a XSS vulnerability in CVS show_subdir_lastmod support. The impact of this vulnerability is mitigated by the need for an attacker to have commit privileges to a CVS repository exposed by an otherwise trusted ViewVC instance that also has the `show_subdir_lastmod` feature enabled. The attack vector involves files with unsafe names (names that, when embedded into an HTML stream, would cause the browser to run unwanted code), which themselves can be challenging to create. This vulnerability is patched in versions 1.2.1 and 1.1.28.

NVD Source

Technical Analysis

CVE-2020-5283 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.High
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N

Affected Vendors & Products

viewvc1 product(s)
viewvc
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/viewvc/viewvc/commit/ad0f966e9a997b17d853a6972ea283d4dcd70fa8
PATCHhttps://github.com/viewvc/viewvc/security/advisories/GHSA-xpxf-fvqv-7mfg
PATCHhttps://github.com/viewvc/viewvc/commit/ad0f966e9a997b17d853a6972ea283d4dcd70fa8
PATCHhttps://github.com/viewvc/viewvc/security/advisories/GHSA-xpxf-fvqv-7mfg
ADVISORYhttps://github.com/viewvc/viewvc/issues/211
ADVISORYhttps://github.com/viewvc/viewvc/issues/211

All References (8)

→
https://github.com/viewvc/viewvc/commit/ad0f966e9a997b17d853a6972ea283d4dcd70fa8Patch · Third Party Advisory
→
https://github.com/viewvc/viewvc/issues/211Exploit · Issue Tracking · Third Party Advisory
→
https://github.com/viewvc/viewvc/security/advisories/GHSA-xpxf-fvqv-7mfgMitigation · Patch · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2Q2STF2MKT24HXZ3YZIU7CN6F6QM67I5/
→
https://github.com/viewvc/viewvc/commit/ad0f966e9a997b17d853a6972ea283d4dcd70fa8Patch · Third Party Advisory
→
https://github.com/viewvc/viewvc/issues/211Exploit · Issue Tracking · Third Party Advisory
→
https://github.com/viewvc/viewvc/security/advisories/GHSA-xpxf-fvqv-7mfgMitigation · Patch · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2Q2STF2MKT24HXZ3YZIU7CN6F6QM67I5/

Quick Facts

CVE IDCVE-2020-5283
CVSS Score3.5 / 10
SeverityLOW
WeaknessCWE-80
CISA KEVNo
Affected1 vendor(s)
PublishedApr 3, 2020

Related CVEs (CWE-80)

CVE-2023-39216
9.8
CVE-2019-13923
9.6
CVE-2025-53883
9.3
CVE-2022-25620
9.0
CVE-2021-27915
9.0
CVE-2026-32891
9.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-5283 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2020-5283·NVD