CVE-2023-29409

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2023-08-02. NVD baseline CVSS 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 1%CVSS: 5.3Exploit: NoneExposed: 0

A fix is available — apply it.

Extremely large RSA keys in certificate chains can cause a client/server to expend significant CPU time verifying signatures. With fix, the size of RSA keys transmitted during handshakes is restricted to <= 8192 bits. Based on a survey of publicly trusted RSA keys, there are currently only three certificates in circulation with keys larger than this, and all three appear to be test certificates that are not actively deployed. It is possible there are larger keys in use in private PKIs, but we target the web PKI, so causing breakage here in the interests of increasing the default safety of users of crypto/tls seems reasonable.

CVSS v3
5.3
EG Score
5.3(medium)
EPSS
67.7%
KEV
Not listed

Published

August 2, 2023

Last Modified

November 21, 2024

References (12)

Vendor Advisories for CVE-2023-29409(20)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(30)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatcontainer-tools:rhel8-8100020240227110532.828888972024-05-22redhat
redhatodf4/cephcsi-rhel9:v4.15.0-372024-03-19redhat
redhatmta/mta-windup-addon-rhel9:6.2.2-32024-02-28redhat
redhatopenshift-0:4.14.0-202401121302.p0.ge36e183.assembly.stream.el82024-01-23redhat
redhatmicroshift-0:4.14.10-202401181720.p0.gd25a4c5.assembly.4.14.10.el92024-01-23redhat
redhatcontainer-tools:4.0-8090020231207142256.d7b6f4b72024-01-10redhat
redhatskopeo-2:1.13.3-3.el9_32023-12-12redhat
redhatpodman-2:4.6.1-7.el9_32023-12-12redhat
redhatbuildah-1:1.31.3-2.el9_32023-12-12redhat
redhatcontainernetworking-plugins-1:1.3.0-6.el9_32023-12-12redhat
redhatrunc-4:1.1.9-2.el9_32023-12-12redhat
redhatopenshift-clients-0:4.14.0-202311031050.p0.g9b1e0d2.assembly.stream.el82023-11-15redhat
redhatcert-manager/cert-manager-operator-rhel9:v1.11.5-52023-11-15redhat
redhatopenshift-serverless-clients-0:1.9.2-4.el82023-11-03redhat
redhatopenshift-serverless-1-tech-preview/logic-swf-devmode-rhel8:1.30.0-92023-11-02redhat
redhatrunc-4:1.1.9-2.1.rhaos4.14.el82023-10-31redhat
redhatrhmtc/openshift-velero-plugin-rhel8:v1.7.14-32023-10-30redhat
redhatrun-once-duration-override-operator/run-once-duration-override-rhel8:v1.0-302023-10-26redhat
redhatopenshift-secondary-scheduler-operator/secondary-scheduler-operator-rhel8:v1.1-372023-10-26redhat
redhatoadp/oadp-velero-rhel8:1.1.7-62023-10-25redhat
redhatmigration-toolkit-virtualization/mtv-rhel8-operator:2.4.3-32023-10-25redhat
redhatcryostat-tech-preview/cryostat-rhel8-operator:2.3.1-112023-10-23redhat
redhatnetwork-observability/network-observability-rhel9-operator:v1.4.0-512023-10-20redhat
redhatrhosp-rhel9/osp-director-operator-bundle:1.3.1-182023-10-20redhat
redhatcollectd-libpod-stats-0:1.0.4-5.el8ost2023-10-20redhat
redhatetcd-0:3.3.23-15.el8ost2023-10-20redhat
redhatstf/smart-gateway-rhel8-operator:5.0.1-92023-10-20redhat
redhatcollectd-libpod-stats-0:1.0.5-6.el9ost2023-10-20redhat
redhatopenshift-logging/logging-loki-rhel8:v2.9.2-12023-10-20redhat
redhatopenshift-logging/logging-loki-rhel8:v2.9.2-22023-10-20redhat

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.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
stdlib—1.21.0-rc.4—

Weakness Classification(1)

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

Additional Vendor Advisories

(11)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 9× in last 7d / 45× 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.

  1. 2026-07-11 08:25 UTCEPSS rescore
  2. 2026-07-11 08:25 UTCEPSS rescore
  3. 2026-07-09 19:08 UTCEPSS rescore
  4. 2026-07-09 19:08 UTCEPSS rescore
  5. 2026-07-08 15:13 UTCEPSS rescore
  6. 2026-07-07 13:44 UTCEPSS rescore
  7. 2026-07-06 16:26 UTCEPSS rescore
  8. 2026-07-06 16:26 UTCEPSS rescore
  9. 2026-07-05 02:28 UTCEPSS rescore
  10. 2026-07-04 06:29 UTCEPSS rescore
  11. 2026-07-02 16:59 UTCEPSS rescore
  12. 2026-07-01 15:04 UTCEPSS rescore
  13. 2026-06-30 23:21 UTCEPSS rescore
  14. 2026-06-30 23:21 UTCEPSS rescore
  15. 2026-06-29 14:05 UTCEPSS rescore
  16. 2026-06-28 14:06 UTCEPSS rescore
  17. 2026-06-28 14:06 UTCEPSS rescore
  18. 2026-06-28 04:54 UTCEPSS rescore
  19. 2026-06-27 14:04 UTCOSV refresh
  20. 2026-06-27 03:07 UTCEPSS rescore
  21. 2026-06-25 13:48 UTCEPSS rescore
  22. 2026-06-25 13:48 UTCEPSS rescore
  23. 2026-06-24 14:03 UTCEPSS rescore
  24. 2026-06-24 14:03 UTCEPSS rescore
  25. 2026-06-23 21:31 UTCEPSS rescore
Show 59 more
  1. 2026-06-23 21:31 UTCEPSS rescore
  2. 2026-06-22 14:24 UTCEPSS rescore
  3. 2026-06-22 14:24 UTCEPSS rescore
  4. 2026-06-21 14:55 UTCEPSS rescore
  5. 2026-06-21 14:55 UTCEPSS rescore
  6. 2026-06-21 01:58 UTCEPSS rescore
  7. 2026-06-21 01:58 UTCEPSS rescore
  8. 2026-06-19 19:24 UTCEPSS rescore
  9. 2026-06-19 19:24 UTCEPSS rescore
  10. 2026-06-18 17:51 UTCEPSS rescore
  11. 2026-06-18 17:51 UTCEPSS rescore
  12. 2026-06-17 17:51 UTCEPSS rescore
  13. 2026-06-17 17:51 UTCEPSS rescore
  14. 2026-06-16 17:51 UTCEPSS rescore
  15. 2026-06-16 17:51 UTCEPSS rescore
  16. 2026-06-15 17:47 UTCEPSS rescore
  17. 2026-06-14 23:16 UTCEPSS rescore
  18. 2026-06-13 22:59 UTCEPSS rescore
  19. 2026-06-13 22:59 UTCEPSS rescore
  20. 2026-06-12 23:10 UTCEPSS rescore
  21. 2026-06-11 13:59 UTCEPSS rescore
  22. 2026-06-10 22:17 UTCEPSS rescore
  23. 2026-06-10 13:21 UTCEPSS rescore
  24. 2026-06-10 13:21 UTCEPSS rescore
  25. 2026-06-10 00:47 UTCOSV refresh
  26. 2026-06-08 14:15 UTCEPSS rescore
  27. 2026-06-08 14:15 UTCEPSS rescore
  28. 2026-06-07 15:23 UTCEPSS rescore
  29. 2026-06-07 15:23 UTCEPSS rescore
  30. 2026-06-06 13:46 UTCEPSS rescore
  31. 2026-06-06 13:46 UTCEPSS rescore
  32. 2026-06-05 22:46 UTCEPSS rescore
  33. 2026-06-05 22:46 UTCEPSS rescore
  34. 2026-06-05 06:09 UTCEPSS rescore
  35. 2026-06-05 06:09 UTCEPSS rescore
  36. 2026-06-04 13:11 UTCEPSS rescore
  37. 2026-06-04 13:11 UTCEPSS rescore
  38. 2026-06-02 20:12 UTCEPSS rescore
  39. 2026-06-02 20:12 UTCEPSS rescore
  40. 2026-06-02 20:12 UTCEPSS rescore
  41. 2026-06-01 13:51 UTCEPSS rescore
  42. 2026-05-31 22:29 UTCEPSS rescore
  43. 2026-05-31 22:29 UTCEPSS rescore
  44. 2026-05-31 22:29 UTCEPSS rescore
  45. 2026-05-31 00:15 UTCEPSS rescore
  46. 2026-05-31 00:15 UTCEPSS rescore
  47. 2026-05-29 13:43 UTCEPSS rescore
  48. 2026-05-28 13:43 UTCEPSS rescore
  49. 2026-05-28 13:43 UTCEPSS rescore
  50. 2026-05-27 13:39 UTCEPSS rescore
  51. 2026-05-27 13:39 UTCEPSS rescore
  52. 2026-05-26 13:43 UTCEPSS rescore
  53. 2026-05-26 13:43 UTCEPSS rescore
  54. 2026-05-26 07:18 UTCEPSS rescore
  55. 2026-05-26 07:18 UTCEPSS rescore
  56. 2026-05-26 07:17 UTCEPSS rescore
  57. 2026-05-24 20:16 UTCEG score recompute
  58. 2026-05-24 20:16 UTCVendor advisory
  59. 2026-05-24 20:16 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2023-29409?
CVE-2023-29409 is a medium vulnerability published on August 2, 2023. Extremely large RSA keys in certificate chains can cause a client/server to expend significant CPU time verifying signatures. With fix, the size of RSA keys transmitted during handshakes is restricted to <= 8192 bits. Based on a survey of publicly trusted RSA keys, there are currently only three…
When was CVE-2023-29409 disclosed?
CVE-2023-29409 was first published in the National Vulnerability Database on August 2, 2023, 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-2023-29409 actively exploited?
CVE-2023-29409 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 67.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-29409?
CVE-2023-29409 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2023-29409?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-29409, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2023-29409

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