CVE-2021-20307

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-24. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

Format string vulnerability in panoFileOutputNamesCreate() in libpano13 2.9.20~rc2+dfsg-3 and earlier can lead to read and write arbitrary memory values.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation2% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
78.0%
KEV
Not listed

Published

April 5, 2021

Last Modified

November 21, 2024

Advisory Details (7)

Auto-updated Jun 22, 2026
Patch available. Sources: redhat.
generic

[SECURITY] Fedora 34 Update: libpano13-2.9.20-1.fc34 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FVJRXUOBN56ZWP6QQ3NTA6DIFZMDZAEQ/
generic Patch Available

[SECURITY] [DLA 2624-1] libpano13 security update

https://lists.debian.org/debian-lts-announce/2021/04/msg00010.html
redhat Patch Available

1946284 – (CVE-2021-20307) CVE-2021-20307 libpano13: Format string vulnerability in panoFileOutputNamesCreate()

https://bugzilla.redhat.com/show_bug.cgi?id=1946284
generic

Panorama Tools - Browse /libpano13/libpano13-2.9.20 at SourceForge.net

https://sourceforge.net/projects/panotools/files/libpano13/libpano13-2.9.20/
generic

libpano13: Format string vulnerability (GLSA 202107-47) — Gentoo security

https://security.gentoo.org/glsa/202107-47
generic

[SECURITY] Fedora 32 Update: libpano13-2.9.20-1.fc32 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VYDYBKHT2MNMQCUMAVJNZW4VH6MD5BOF/
generic

[SECURITY] Fedora 33 Update: libpano13-2.9.20-1.fc33 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JE6YZSXNVD6WZ3AG3ENL2DIHQFF24LYX/

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibpano13-dev (2.9.20~rc3+dfsg-1ubuntu0.1~esm1) @ jammy2026-05-26ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 11× in last 7d / 49× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 104 total refreshes for this CVE.

  1. 2026-07-23 01:56 UTCEG score recompute
  2. 2026-07-22 22:43 UTCEG score recompute
  3. 2026-07-22 14:05 UTCEPSS rescore
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  73. 2026-05-26 18:44 UTCVendor advisory
  74. 2026-05-26 18:44 UTCGHSA enrichment
  75. 2026-05-26 13:42 UTCEPSS rescore

Frequently asked(5)

What is CVE-2021-20307?
CVE-2021-20307 is a critical vulnerability published on April 5, 2021. Format string vulnerability in panoFileOutputNamesCreate() in libpano13 2.9.20~rc2+dfsg-3 and earlier can lead to read and write arbitrary memory values.
When was CVE-2021-20307 disclosed?
CVE-2021-20307 was first published in the National Vulnerability Database on April 5, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-20307 actively exploited?
CVE-2021-20307 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 78.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-20307?
CVE-2021-20307 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2021-20307?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-20307, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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