CVE-2020-7957

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 1.9%, top 23% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 5.3Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

The IMAP and LMTP components in Dovecot 2.3.9 before 2.3.9.3 mishandle snippet generation when many characters must be read to compute the snippet and a trailing > character exists. This causes a denial of service in which the recipient cannot read all of their messages.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity53% × 45%
Exploitation2% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
78%
KEV
Not listed

Published

February 12, 2020

Last Modified

November 21, 2024

References (10)

Affected Packages

(17 across 17 ecosystems)
Alpine:v3.10(1)
PackageVulnerable rangeFixed inDependents
dovecot—2.3.10.1-r0—
Alpine:v3.11(1)
PackageVulnerable rangeFixed inDependents
dovecot—2.3.9.3-r0—
Alpine:v3.12(1)
PackageVulnerable rangeFixed inDependents
dovecot—2.3.9.3-r0—
Alpine:v3.13(1)
PackageVulnerable rangeFixed inDependents
dovecot—2.3.9.3-r0—
Alpine:v3.14(1)
PackageVulnerable rangeFixed inDependents
dovecot—2.3.9.3-r0—
Alpine:v3.15(1)
PackageVulnerable rangeFixed inDependents
dovecot—2.3.9.3-r0—
Alpine:v3.16(1)
PackageVulnerable rangeFixed inDependents
dovecot—2.3.9.3-r0—
Alpine:v3.17(1)
PackageVulnerable rangeFixed inDependents
dovecot—2.3.9.3-r0—
Alpine:v3.18(1)
PackageVulnerable rangeFixed inDependents
dovecot—2.3.9.3-r0—
Alpine:v3.19(1)
PackageVulnerable rangeFixed inDependents
dovecot—2.3.9.3-r0—
Alpine:v3.20(1)
PackageVulnerable rangeFixed inDependents
dovecot—2.3.9.3-r0—
Alpine:v3.21(1)
PackageVulnerable rangeFixed inDependents
dovecot—2.3.9.3-r0—
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
dovecot—2.3.9.3-r0—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
dovecot—2.3.9.3-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
dovecot—2.3.9.3-r0—
Alpine:v3.8(1)
PackageVulnerable rangeFixed inDependents
dovecot—2.3.10.1-r0—
Alpine:v3.9(1)
PackageVulnerable rangeFixed inDependents
dovecot—2.3.10.1-r0—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 28× 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 130 total refreshes for this CVE.

  1. 2026-08-21 04:44 UTCOSV refresh
  2. 2026-08-19 17:00 UTCEPSS rescore
  3. 2026-08-18 13:44 UTCEPSS rescore
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  1. 2026-07-24 14:15 UTCEPSS rescore
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  3. 2026-07-23 01:55 UTCEG score recompute
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  10. 2026-07-19 19:18 UTCOSV refresh
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  24. 2026-07-11 08:25 UTCEPSS rescore
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  26. 2026-07-09 19:07 UTCEPSS rescore
  27. 2026-07-08 15:12 UTCEPSS rescore
  28. 2026-07-07 13:43 UTCEPSS rescore
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  66. 2026-06-14 08:43 UTCOSV refresh
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  75. 2026-06-08 14:15 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2020-7957?
CVE-2020-7957 is a medium vulnerability published on February 12, 2020. The IMAP and LMTP components in Dovecot 2.3.9 before 2.3.9.3 mishandle snippet generation when many characters must be read to compute the snippet and a trailing > character exists. This causes a denial of service in which the recipient cannot read all of their messages.
When was CVE-2020-7957 disclosed?
CVE-2020-7957 was first published in the National Vulnerability Database on February 12, 2020, 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-2020-7957 actively exploited?
CVE-2020-7957 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 22.2% of all scored CVEs.
What is the CVSS score of CVE-2020-7957?
CVE-2020-7957 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2020-7957?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-7957, 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.

Dependency Blast Radius

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