# CVE-2024-9143: Low-level invalid GF(2^m) parameters lead to OOB memory access

Status: published. Published: 2024-10-16. Updated: 2026-11-06.

Issue summary: Use of the low-level GF(2^m) elliptic curve APIs with untrusted
explicit values for the field polynomial can lead to out-of-bounds memory reads
or writes.

Impact summary: Out of bound memory writes can lead to an application crash or
even a possibility of a remote code execution, however, in all the protocols
involving Elliptic Curve Cryptography that we're aware of, either only "named
curves" are supported, or, if explicit curve parameters are supported, they
specify an X9.62 encoding of binary (GF(2^m)) curves that can't represent
problematic input values. Thus the likelihood of existence of a vulnerable
application is low.

In particular, the X9.62 encoding is used for ECC keys in X.509 certificates,
so problematic inputs cannot occur in the context of processing X.509
certificates.  Any problematic use-cases would have to be using an "exotic"
curve encoding.

The affected APIs include: EC_GROUP_new_curve_GF2m(), EC_GROUP_new_from_params(),
and various supporting BN_GF2m_*() functions.

Applications working with "exotic" explicit binary (GF(2^m)) curve parameters,
that make it possible to represent invalid field polynomials with a zero
constant term, via the above or similar APIs, may terminate abruptly as a
result of reading or writing outside of array bounds.  Remote code execution
cannot easily be ruled out.

The FIPS modules in 3.3, 3.2, 3.1 and 3.0 are not affected by this issue.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: openssl) — https://github.com/openssl/openssl/commit/c0d3e4d32d2805f49bec30547f225bc4d092e1f4
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: openssl) — https://github.com/openssl/openssl/commit/bc7e04d7c8d509fb78fc0e285aa948fb0da04700
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: openssl) — https://github.com/openssl/openssl/commit/fdf6723362ca51bd883295efe206cb5b1cfa5154
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: openssl) — https://github.com/openssl/openssl/commit/72ae83ad214d2eef262461365a1975707f862712
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: openssl) — https://github.openssl.org/openssl/extended-releases/commit/8efc0cbaa8ebba8e116f7b81a876a4123594d86a
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: openssl) — https://github.openssl.org/openssl/extended-releases/commit/9d576994cec2b7aa37a91740ea7e680810957e41

## Affected products and versions

- OpenSSL / OpenSSL: ≥ 3.3.0; < 3.3.3 (affected, semver); ≥ 3.2.0; < 3.2.4 (affected, semver); ≥ 3.1.0; < 3.1.8 (affected, semver); ≥ 3.0.0; < 3.0.16 (affected, semver); ≥ 1.1.1; < 1.1.1zb (affected, custom); ≥ 1.0.2; < 1.0.2zl (affected, custom). Source: CNA: openssl
- Siemens / SIDIS Prime: ≥ 0; < V4.0.700 (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518-4 PN/DP MFP: ≥ V3.1.0; < V3.1.5 (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP: ≥ V3.1.0; < V3.1.5 (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 TM MFP - GNU/Linux subsystem: ≥ 0; < V1.1.1 (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIPLUS S7-1500 CPU 1518-4 PN/DP MFP: ≥ V3.1.0; < V3.1.5 (affected, custom). Source: ADP: siemens-SADP

## Severity and prioritization

- CVSS 3.1: 8.8 (high); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H; source: ADP: CISA-ADP

- CVSS 3.1: 8.8 (high); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H; source: NVD: 134c704f-9b21-4f2e-91b3-4a467353bcc0

- CISA KEV: No listing in collected sources

- EPSS: 5.84% as of 2026-11-06; percentile 93.21%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-125, CWE-787

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://openssl-library.org/news/secadv/20241016.txt (CNA: openssl; vendor-advisory)

- https://github.com/openssl/openssl/commit/c0d3e4d32d2805f49bec30547f225bc4d092e1f4 (CNA: openssl; patch)

- https://github.com/openssl/openssl/commit/bc7e04d7c8d509fb78fc0e285aa948fb0da04700 (CNA: openssl; patch)

- https://github.com/openssl/openssl/commit/fdf6723362ca51bd883295efe206cb5b1cfa5154 (CNA: openssl; patch)

- https://github.com/openssl/openssl/commit/72ae83ad214d2eef262461365a1975707f862712 (CNA: openssl; patch)

- https://github.openssl.org/openssl/extended-releases/commit/8efc0cbaa8ebba8e116f7b81a876a4123594d86a (CNA: openssl; patch)

- https://github.openssl.org/openssl/extended-releases/commit/9d576994cec2b7aa37a91740ea7e680810957e41 (CNA: openssl; patch)

- http://www.openwall.com/lists/oss-security/2024/10/16/1 (ADP: CVE)

- http://www.openwall.com/lists/oss-security/2024/10/23/1 (ADP: CVE)

- http://www.openwall.com/lists/oss-security/2024/10/24/1 (ADP: CVE)

- https://security.netapp.com/advisory/ntap-20241101-0001/ (ADP: CVE)

- https://lists.debian.org/debian-lts-announce/2024/11/msg00000.html (ADP: CVE)

- https://lists.debian.org/debian-lts-announce/2024/10/msg00033.html (ADP: CVE)

- https://cert-portal.siemens.com/productcert/html/ssa-398330.html (ADP: siemens-SADP)

- https://cert-portal.siemens.com/productcert/html/ssa-265688.html (ADP: siemens-SADP)

- https://cert-portal.siemens.com/productcert/html/ssa-769027.html (ADP: siemens-SADP)

- https://cert-portal.siemens.com/productcert/html/ssa-277137.html (ADP: siemens-SADP)

- https://github.com/openssl/openssl/commit/72ae83ad214d2eef262461365a1975707f862712 (openssl-security@openssl.org)

- https://github.com/openssl/openssl/commit/bc7e04d7c8d509fb78fc0e285aa948fb0da04700 (openssl-security@openssl.org)

- https://github.com/openssl/openssl/commit/c0d3e4d32d2805f49bec30547f225bc4d092e1f4 (openssl-security@openssl.org)

- https://github.com/openssl/openssl/commit/fdf6723362ca51bd883295efe206cb5b1cfa5154 (openssl-security@openssl.org)

- https://github.openssl.org/openssl/extended-releases/commit/8efc0cbaa8ebba8e116f7b81a876a4123594d86a (openssl-security@openssl.org)

- https://github.openssl.org/openssl/extended-releases/commit/9d576994cec2b7aa37a91740ea7e680810957e41 (openssl-security@openssl.org)

- https://openssl-library.org/news/secadv/20241016.txt (openssl-security@openssl.org)

- http://www.openwall.com/lists/oss-security/2024/10/16/1 (af854a3a-2127-422b-91ae-364da2661108)

- http://www.openwall.com/lists/oss-security/2024/10/23/1 (af854a3a-2127-422b-91ae-364da2661108)

- http://www.openwall.com/lists/oss-security/2024/10/24/1 (af854a3a-2127-422b-91ae-364da2661108)

- https://lists.debian.org/debian-lts-announce/2024/10/msg00033.html (af854a3a-2127-422b-91ae-364da2661108)

- https://lists.debian.org/debian-lts-announce/2024/11/msg00000.html (af854a3a-2127-422b-91ae-364da2661108)

- https://security.netapp.com/advisory/ntap-20241101-0001/ (af854a3a-2127-422b-91ae-364da2661108)

- https://cert-portal.siemens.com/productcert/html/ssa-265688.html (0b142b55-0307-4c5a-b3c9-f314f3fb7c5e)

- https://cert-portal.siemens.com/productcert/html/ssa-277137.html (0b142b55-0307-4c5a-b3c9-f314f3fb7c5e)

- https://cert-portal.siemens.com/productcert/html/ssa-398330.html (0b142b55-0307-4c5a-b3c9-f314f3fb7c5e)

- https://cert-portal.siemens.com/productcert/html/ssa-769027.html (0b142b55-0307-4c5a-b3c9-f314f3fb7c5e)

## Provenance

- CNA: openssl: https://www.cve.org/CVERecord?id=CVE-2024-9143; retrieved 2026-11-06; source updated 2026-11-06

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-9143; retrieved 2026-11-07; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2024-9143; retrieved 2026-11-06; source updated Not reported

Revision: c06942b8881f0a739d04dbeb5801c895720af0317629f08d3668b4ff8e1aba59

Canonical: https://y2.dev/cve/CVE-2024-9143

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.